Are You Wanting To Become a Pilot?
Find Out How to Save Hundreds to Thousands of Dollars When it Comes to Your Flight Training!

Recent Posts

How Big are Aircraft Runways?


Have you ever sat in an airport terminal looking at the runway and wondered about the dimensions of runways? How long is a particular runway, and why? What determines runway width, and how deep is the pavement?

Runway size is designed based on the size of aircraft that will be using them and the local year-round climactic conditions. Larger aircraft need longer, wider, and stronger runways than small aircraft. Most international airport runways are at least 150ft/46m wide & 6,000-15,000ft/1,829-4,572m long.

When planning to construct a runway, engineers need to consider the type of aircraft that will most frequently be utilizing the facility this will be the biggest deciding factor in the future of the airport.

The altitude and climate will help determine the length of the runway and type of preferred surface (i.e., concrete, asphalt, or a combination), and it’s crucial to know if there is a slope to the land, no matter how slight, so that the runway length is just right for ideal operations.

Much like the length, the builders of a new runway will need to know what type of aircraft will be taking off and landing most frequently, so that the correct width is planned based on FAA categorization (More on this later).

During my private pilot training, I experienced runways that were as narrow as 35 feet, to as wide as 150 feet. Sitting in a small 2-seat aircraft on a 150ft wide runway on which large commercial jet airplane land is an intimidating experience when you first line up for takeoff!

Let’s get into more runway design specifics.

How is Runway Length Determined?

The Federal Aviation Administration (FAA) has established recommended runway lengths that are spelled out in Advisory Circular 150/5325-4B. Initially, all airport locations are considered to be identical with no obstructions for takeoff or landing, no wind, a dry runway surface, and totally flat terrain.

Planners then consider the type of aircraft that will most likely be utilizing the field, from small planes weighing no more than 12,500lbs / 5,670kg at takeoff, to larger planes that weigh in excess of the same weight specification.

Other crucial factors that help determine runway length include the field’s altitude, climactic factors such as hot weather, strong winds, or frequent snowy or icy conditions. Each of these factors will lead to a longer runway than a dry one located at sea level, with no discernable landing or takeoff difficulties (think San Diego).

Here are some typical aircraft takeoff roll distances at 50°F, sea level, no wind, max gross weight:

Cessna 152 (2 seats)775ft / 236m
Beech Bonanza (6 seats)1,913ft / 583m
Boeing 737-8004,955ft / 1,510m
Gulfstream 500 (private jet) 5,300ft / 1,615m
Airbus A3217,500ft / 2,286m
Airbus A3809,800ft / 2,987m
Boeing 777-30011,614ft / 3,540m
ft =Feet, m = Meters

On the flip side is Denver International Airport with an elevation of over 5,400feet / 1,645meters and frequent snow and ice during the winter season, and Phoenix Sky Harbor International Airport where summer temperatures well over 100°F degrees are common.

Take the Boeing 737-800 above. At sea level with standard atmospheric conditions (wiki link) it will take around 4,955ft / 1,510m to become airborne. Take the exact same aircraft and have it take off a runway but at 4,000ft / 1,220m and it now requires a takeoff roll of 6,000ft / 1,830m!

A higher altitude, expected inclement weather, and excessive heat are all reasons designers add considerable length to a runway as all of these conditions degrade the aircraft’s performance in some way and the additional space is required to allow the aircraft to operate safely without running out of runway.

Long Runways at Some Major International Airports:

Airports with longer runways that could accommodate jet aircraft were mostly built in the 1960s or later, and are primarily located farther from the city center where land was available at the time of construction.

Here are some of the world’s busiest airports:

AirportRunway LengthRunway Width
John F. Kennedy International Airport, New York14,572ft / 4,442m200ft / 61m
Hartsfield-Jackson Atlanta International Airport14,001ft / 4,268m200ft / 61m
Istanbul New Airport13,500ft / 4,115m200ft / 61m
Narita International Airport, Tokyo 13,123ft / 4,000m200ft / 61m
Miami International Airport13,016ft / 3,967m150ft / 46m
Chicago O’Hare International Airport13,000ft / 3,962m150ft / 46m
Los Angeles International Airport12,923ft / 3,939m150ft / 46m
London Heathrow International Airport12,800ft / 3,901m150ft / 46m
Beijing Daxing International Airport12,500ft / 3,810m150ft / 46m
Phoenix Sky Harbor International Airport11,500ft / 3,505m150ft / 46m

Short, Longest Runways at Some Major U.S. Airports:

These airports were built close to the downtown core well before the jet-age, in order to service propeller-driven aircraft that required far less runway than today’s jetliners:

AirportRunway LengthRunway Width
Dallas Love Field8,800ft / 2,682m150ft / 46m
Houston Hobby Airport7,602ft / 2,317m150ft / 46m
Washington/Reagan National Airport7,169ft / 2,185m150ft / 46m
La Guardia Airport, New York7,000ft / 2,134m150ft / 46m
Midway Airport, Chicago6,522ft / 1,988m150ft / 46m

Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

Where are Some of the Longest Runways in the World?

Qamdo Bamda Airport (ZUBD), Tibet, China

Located high in the Hengduan Mountain Range at 14,435ft / 4,400m above sea level, the 18,045ft / 5,500m runway is necessary because aircraft engine performance is drastically reduced with the high altitude location of this runway. This requires longer takeoff rolls necessitating higher speeds, as well as increased landing distances.

Zhukovsky International Airport (UUBW), Moscow, Russia

The newest passenger airport in the city opened in 2016 with its major runway being 17,723ft / 5,400m long! Planners decided on such a long runway to accommodate any size aircraft that may be developed in the future. This airport was built with the future in mind, not only for its runway, but passenger terminals, and baggage handling system.

Denver International Airport (KDEN), Colorado, USA

Denver has the longest runway in the Americas, 16R/34L, at 16,000ft / 4,877m. Given its elevation of 5,433ft / 1,655m above sea level, it’s no surprise that such a long runway is needed in order to handle passenger jets as large as the Airbus A380 double-decker.

Learn More
Try These Articles:
* What are Airport Landing Fees?
* How Much Do Airplanes Weigh? (With 20 Examples)

How is Runway Width Determined?

While there are no minimum or maximum runway width requirements, each airport has to provide enough tarmac to attract the size of aircraft they anticipate will be using the airport. The same holds true for the taxiways so that even the largest aircraft that may utilize the airport is also able to move around the field efficiently and without coming into contact with other aircraft, structures, or ground vehicles.

The FAA has developed the ADG (Airplane Design Group) that uses an aircraft’s wingspan and tail height above ground to determine the runway width required for safe operation. There are six ADG categories with category I (100ft width or less), up to category VI (200ft).

ADG CategoryWingspanMin Runway Width
I<49ft / 15m100ft / 30m
II49ft – 79ft / 15m – 24m100ft / 30m
III79ft – 118ft / 24m – 36m100ft / 30m
IV118ft – 171ft / 36m – 52m150ft / 46m
V171ft – 214ft / 52m – 65m150ft / 46m
Vi214ft – 262ft / 65m – 80m200ft / 61m

With the exception of airports at high altitudes or with extreme weather conditions, a runway width of at least 100 feet is required to handle the Airbus A318, A319, A320, and A321, as well as various models of the Boeing 737.

An additional 50 feet is necessary for aircraft such as the Airbus A330, A340, and the Boeing 747, 757, and 767.

How Thick are Runways Built?

Depending on the expected weight of aircraft utilizing an airport, runways may be anywhere from 10 inches to as much as four feet thick, including the subgrade or formation level. Asphalt, concrete, or a combination of the two are the man-made components used to make runways.

For the most part, major international airports construct their runways from concrete, as it is more stable and durable, especially when the surface needs to withstand the weight of thousands of heavy aircraft operations over the years.

Smaller general aviation airports often utilize asphalt due to smaller, lighter aircraft operating there, and asphalt being less expensive to install.

Typical international airport runways are constructed in layers as follows:

  1. 12-inch soil and lime base is added to the existing soil
  2. Six inches of permeable asphalt for drainage
  3. Six inches of a denser asphalt base to provide a firm platform for the concrete to be poured on top
  4. 16-21 inches of poured concrete in 20 x 20-foot sections reinforced with Rebar.

Can You Build a Runway on Your Property?

If you have the land and the location fits the FAA’s rules and regulations, you can build a runway for personal use.

You can find the regulations pertaining to runway construction under FAR Part 157 and also FAA Forms 7480-1, Notice for Construction, Alteration, and Deactivation of Airports.

To construct your own runway you’ll need:

  • A minimum of one acre of land to accommodate a small general aviation aircraft
  • A mixture of topsoil, sand, and gravel for the runway surface
  • Construction equipment to clear and level the land or, hire a competent construction company to do the job for you
  • The FAA stipulates that the runway must be at least 500 feet long and 50 feet wide
  • You must erect signage clearly indicating the existence of your airstrip
  • It must have a clear departure and approach path for you and any other pilots that may use the field.
  • Private airstrips may not be built for commercial purposes
  • The runway will need to be properly marked and lit if to be used at night

You may even want to consider a grass strip as this really reduces the cost of building your own runway.

There may also be local zoning laws to follow, so be sure to obtain the necessary building permits and/or zoning approval from your local municipality. And just to play it safe, it is recommended that you contact the FAA directly to be absolutely certain you haven’t overlooked any of their very specific rules.

Learn More
Try These Articles:
* How Do Pilots Know Where to Taxi Around an Airport?
* Can Airplanes Land In Fog? A Pilot Tells All!

Boeing 737-Max Lawsuits: All You Need to Know!


The Boeing 737 Max tragedies sparked an enormous amount of litigation. From criminal prosecutions and individual civil claims to class action lawsuits and shareholder proceedings, the legal fallout resulting from the 737 Max disasters has been colossal. 

After talking with a former aviation lawyer, I was really interested to find out what happened with all the following legal proceedings and this is what I found. Below, I’ll outline what you need to know about the various Boeing 737 Max lawsuits that have emerged. Some have settled – and some are ongoing. 

What Happened with the Boeing 737 Max?

The Boeing 737 Max is the fourth generation of Boeing 737 aircraft, manufactured by U.S. aircraft manufacturer Boeing. It was designed to compete with the Airbus A320neo series and was certified by the Federal Aviation Administration (FAA) in March 2017.

However, the 737 Max quickly became associated with tragedy. In October 2018, Lion Air Flight 610 (a 737 Max 8) crashed into the Java Sea only 13 minutes after taking off from Jakarta, Indonesia, killing all 189 people onboard.  Less than 6 months later in March 2019, Ethiopian Airlines Flight 302 (another 737 Max 8) crashed six minutes after taking off from Addis Ababa, Ethiopia, killing all 157 people onboard.

Grounded B737 Max 8 Airplanes at Boeing’s WA Facility – Source: SounderBruce

Over 50 aviation authorities across the world grounded the aircraft and, by 18 March 2019, all 387 planes were taken out of the air amid concerns the aircraft had a fatal flaw in its design.

What Caused the Boeing 737 Max Crashes?

Investigations revealed that the fundamental problem with the 737 Max series was a failure in the Manoeuvring Characteristics Augmentation System (MCAS), which was a major contributor to both crashes.

The MCAS was originally designed as a stabilizing system for the aircraft. It would detect when the plane entered into a steep climb and then automatically ’tilt’ the aircraft nose back down to its regular angle of attack (AoA) to prevent the airplane from stalling.

The system was installed because the 737 Max relied on a new engine known as the LEAP-1Bs, which were much heavier than previously used engines. They were placed higher up on the aircraft wings so that they didn’t sit too close to the ground, resulting in the aircraft to ‘Pitch Nose Up’ when entering into a steep climb. MCAS was supposed to be the stabilizing solution to that issue.

However, the MCAS didn’t work the way it was supposed to – and under certain conditions uncontrollably dropped the nose of the aircraft and sent it into a dive.

In a surprising twist of events, it was later revealed that, before the Lion Air crash, information about MCAS was removed from the aircraft’s flight manual – meaning pilots didn’t know about it until the first fatal crash.


Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

What Lawsuits Followed the Boeing 737 Max Accidents?

Litigation resulting from the 737 Max tragedy was both civil and criminal, with proceedings commenced by prosecutors, families of the victims, shareholders, and other companies who had a stake in the aircraft. 

Victims’ Families’ Civil Proceedings

There were at least 100 lawsuits filed against Boeing by the families of those who lost their lives in the Lion Air and Ethiopian Airlines disasters. These claims, broadly, alleged that the aircraft was unsafe and that Boeing was liable for damages.

The majority of these claims have now reached a settlement – most, if not all, have confidential settlements. The first was reached in September 2019, when Boeing reportedly agreed to pay $1.2 million each to 11 families of victims of the Lion Air disaster. By July 2020, Boeing settled most of its Lion Air wrongful death lawsuits.

For some, despite the settlement, the heartache did not stop. One lawyer who represented a number of these families allegedly embezzled a large sum of the settlement for himself, leaving each of the families still owed around $500,000. Another law firm, completely unconnected to the proceedings, stepped in and paid these families their owed settlement, deciding to go after the rogue lawyer for themselves. 

The final substantial ‘batch’ of civil lawsuits against Boeing (which were brought by families of the Ethiopian Airlines victims) reached an agreement in November 2021.  The plane manufacturer admitted liability for compensatory damages but avoided liability for punitive damages (that is, damages awarded as punishment, rather than as compensation).

The result was that families could sue Boeing for compensatory damages only – a significant outcome for Boeing that could considerably reduce a payout.

At the time of writing, a number of lawsuits are ongoing.

Learn More
Try These Articles:
* Do All Pilots Need a College Degree? It Depends!
* Do Flight Schools Drug Test Students & Instructors?

Pilot Class Action

Boeing was also sued by over 400 pilots in a class action, who alleged that the 737 Max disasters were an “unprecedented cover-up”. This soon grew to 3,000 pilots from 12 international airlines. The pilots are reportedly seeking “as much as $368 million” in lost income and damages as a result of the 737 Max grounding.

Criminal Charges

After the two crashes, Boeing admitted to deceiving the FAA about the MCAS. This deception resulted in the FAA not publishing information about MCAS, meaning manuals and pilot materials for U.S.-based airlines simply did not have sufficient information about the system that would then contribute to two fatal crashes.

Boeing was charged with one count of conspiracy to defraud the United States. Documents had revealed that the 737 Max’s Chief Technical Pilot, Mark Forkner, told another pilot that MCAS was running “rampant” in a simulator. However, Mr Forkner had also told FAA officials that MCAS was safe. Another document even showed a Boeing employee saying that the 737 Max “is designed by clowns, who in turn are supervised by monkeys”.

Mr Forkner found himself in criminal trouble – charged with four counts of wire fraud for misleading the federal regulator. However, in March 2022, Mr Forkner was found not guilty. He was the only Boeing employee charged with a criminal offense over the 737 Max saga.

Agreement with the U.S. Department of Justice

In January 2021, Boeing entered into a deferred prosecution agreement (DPA) with the U.S. Department of Justice (DoJ). As part of the agreement, the manufacturer agreed to pay a total of $2.5 billion, consisting of:

  • a criminal penalty of $243.6 million;
  • compensation payouts to airline customers in the amount of $1.77 billion; and
  • a $500 million fund to compensate relatives, heirs, and beneficiaries of the passengers who lost their lives on the Lion Air and Ethiopian Airlines flights.

The settlement allows Boeing to avoid criminal prosecution – and was described as a “form of corporate plea bargain”. The full DPA is available for viewing online here.

As part of the $500 million fund, each eligible family is to receive approximately $1.45 million, with money being paid on a rolling basis when claims are submitted and resolved.

Family members of the victims filed a motion in a U.S. court in December 2021 arguing that the U.S. Government “violated their rights through a secret process”, asking that the judge declare that the DPA violated their rights.

In early 2022, the U.S. Government opposed the motion but apologized for not meeting with the victims’ beneficiaries. At the time of writing, this aspect of the Boeing 737 Max litigation is ongoing.

Shareholder Lawsuit Against Boeing

Boeing shareholders commenced proceedings against the global aircraft manufacturer after the two fatal incidents. 

Two shareholders, public pension funds Thomas P. DiNapoli (New York State Comptroller, as trustee of the New York State Common Retirement Fund) and the Fire and Police Pension Association of Colorado filed a derivative lawsuit against Boeing’s current and former directors.

They alleged that Boeing’s directors breached their fiduciary duties by “dismantling Boeing’s lauded safety-engineering corporate culture in favor of what became a financial-engineering corporate culture.” The two organizations, lead plaintiffs in their lawsuit, alleged Boeing’s directors failed to monitor safety so poorly, that it wasn’t even a topic in board meetings.

In November 2021, Boeing’s board of directors agreed to settle the claim for $237.5 million.

In a separate 2019 derivative shareholder class action filed in Illinois, the Seafarers Pension Plan alleged that Boeing board members and officers made false and misleading statements to the public about the 737 Max in proxy materials.

This lawsuit was originally dismissed, with a court finding that Boeing’s bylaws meant the company had a right to insist the claim be filed in Delaware. However, it was later revived in January 2022 when a U.S. appeals court decided it could go ahead.

Other Notable Lawsuits

This article does not attempt to outline every single claim brought against Boeing (nor is it able to). For example, there have also been commercial claims brought by other companies who had signed contracts to purchase the 737 Max. 

However, it should be noted that claims weren’t just brought against Boeing and its directors. Proceedings were brought against other parties too, including the FAA, Spirit AeroSystems (who manufacture aerostructures for Boeing), and even Southwest Airlines

Learn More
Try These Articles:
* Why Do Some Aircraft Fly With Two Pilots & Not One?
* MAYDAY: Why Do Pilots Say Mayday?

What are Airplane Wingtip Vortices?


When a low-flying plane passes through clouds, you may notice some cool-looking spirals coming off the wingtips. These are called wingtip vortices. But what are they and how are they formed? Are these vortices present all the time?

Wingtip vortices are rotating funnels of air that leave the tip of an airplane wing as it flies. Higher air pressure formed under the wing tries to move to the lower pressure above the wing and by flowing around the wing tip this creates the vortices. Large, heavy airplanes create very strong vortices.

Even as a pilot myself, seeing an airplane coming through a cloud or dust and churning up these funnels always gets my attention. To most, they are just a cool visual indication of how air is working around an airplane, but from a pilot’s point of view, these vortices can be extremely hazardous and need respect!

What are Airplane Wingtip Vortices and How are They Created?

Planes achieve lift by creating a pressure difference between the topside and underside of their wings. The shape of the wing creates a higher pressure under the wing than air on top of the wing. This causes an upward force – Lift.

To create this lift the airplane has to be moving through the air.

Air is a pretty simple thing and all it wants to do is stay in balance, also known as equilibrium. When it’s separated from other air pockets around it and the pressure between them is different, they want to rejoin and balance out.

Air always tries to move from a point of high pressure to a point of low pressure and because an airplane wing is artificially creating this difference in air pressure between two pockets, the air is going to move.

Vortices Visible as Flares are Fired from a C17-Globemaster Cargo Jet

Since air is moving at a fast rate across the wings, it becomes near impossible for the air to spill to the topside through the wing. The air, therefore, can only move from the bottom to the top part of the wing by going around the wing tip.

This creates a circular motion of air at the wing tips – The Vortice.

The air coming off the back of the wings instantly balances out but during that split second the air is passing from the front to the back of the wing, the only route available to equalize is around the wing tip.

Because the airplane is moving forward through the air each vortex is left behind but is then joined by the next vortex just created. This creates a funnel similar to a tornado, only laying horizontally.

This tornado-like motion of air is invisible and always present whenever a plane is in forward motion. The faster the airplane wing is moving forward, the more, and stronger the vortices are created. Vortices can only be seen when a plane passes through clouds, high humidity, or some sort of visible particulate suspended in the air.

These suspended particulates move with the airflow and allow you to track how the air is moving with your eyes.


Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

Are Wingtip Vortices Good for Planes? 

Vortices have a negative impact on both the plane producing it and any aircraft behind it. It is because of these vortices that airports are limited to how often an airplane can land or take off.

Some of the major disadvantages of wingtip vortices include:

  • Fuel Inefficiency 
  • Wake Turbulence

Fuel Inefficiency 

As the air spill over the tips of the wing and creates vortices, these in turn create drag. Drag works against the thrust of the engines and tries to slow the aircraft. Although the drag is small and not enough to be noticeable it soon accumulates over a long flight.

Any form of drag reduces the plane’s fuel efficiency as the plane has to spend more fuel thrusting the plane forward to overcome the effects of drag. The less drag an aircraft has, the less thrust is required to propel it through the air.

The less thrust required, the less fuel is consumed.

Because wingtip vortices create drag they increase fuel consumption. The total fuel consumed just to overcome the drag multiplied by the number of hours an airplane flies in its lifetime can equate to millions of dollars in additional fuel costs.

Wake Turbulence

Wake turbulence is the disturbance in the atmosphere caused when wingtip vortices are produced, especially by large and heavy airplanes. They are usually found near the ground at airports as wingtip vortices are more pronounced when planes are flying slow but creating massive amounts of lift, as in the case of takeoffs and landings. 

Vortices get larger as they get farther away from the plane. They are invisible and can stay near the same position for several minutes if there is no wind to help break them apart and allow them to dissipate. All vortices do eventually dissipate but take longer without wind to help.

Airplanes Spaced During Approach to Land

All aircraft, no matter their size produce their most lift when the air that the wings and rotorblades are working on is smooth and undisturbed. Any aircraft encountering unsettled air pockets experiences turbulence. The stronger the disturbance, the greater the turbulence is felt in the aircraft. This is where vortices pose a threat as they linger just above a runway.

If a smaller airplane comes into contact with large vortices from a bigger plane, it may experience violent turbulence. Because the wingtip vortices form a rotating tunnel of air some light aircraft have been caught and have even rolled over uncontrollably and crashed as such cases happen at low altitudes where recovery is almost impossible. 

Even any aircraft experiencing violent turbulence just before touchdown or just after liftoff could be put into a very dangerous situation within close proximity to the ground.

Aircraft that are larger than the aircraft in front of them are less prone to wake turbulence but it does affect them, especially upon landing.

For this reason, planes are required to have adequate separation distances when taking off and landing subsequently. Air traffic controllers will space aircraft apart depending on their size to one another to allow the vortices to dissipate before the next aircraft arrives in that particular parcel of air.

For landing, air traffic controllers follow these guidelines:

Super = > 500,000lbs
Heavy = 300,000 – 500,000lbs
Large = 40,000 – 300,000lbs
Light = < 40,000lbs

First Landing AircraftSecond Landing AircraftSpacing
Super Super4nm
Heavy 6nm
Large7nm
Light8nm
Heavy Heavy4nm
Large5nm
Light6nm
LargeLight4nm

Other precautionary methods to avoid flying into a preceding airplane’s wake turbulence include taking a flight path well above that of the previous plane, which means lifting off at a point on the runway prior to where the last plane took off. This allows the second aircraft to be flying above the slowly sinking vortices of the first aircraft.

A second method is landing beyond the touchdown point of the previous plane. As soon as an airplane lands its lift is instantly decreased, thus the severity of the wing tip vortices created is also decreased. If the second aircraft landing touches down at a point further along the runway from the first airplane’s touchdown point the vortices the pilots will experience will be negligible.

If a pilot doesn’t feel comfortable with the latter as this reduces the distance available for decelerating, they may initiate a go-around. It is for these reasons why air traffic controllers try to separate aircraft so that costly go-arounds are avoided.

Learn More
Try These Articles:
* Do Airplanes Use Hydraulics?
* How Long Can Airplanes Fly For? – Top 10 Routes!

How are Wingtip Vortices Mitigated? 

Since WWII aircraft manufacturers have come up with various methods of reducing wingtip vortices. Although the vortices cannot be completely eliminated, they can be severely reduced using the following methods:

  • Winglets/Sharklets
  • Raked Wingtips 
  • High Aspect Ratio Wings
  • Elliptical Wing Designs

Winglets/Sharklets

These are devices that are fitted to each wingtip and are angled upwards, and sometimes downwards. They can be molded into the wing itself or be bolt-on additions for older aircraft. Each manufacturer has its own designs, but they essentially do the same job.
This has been by far the most common way of mitigating vortices since they were discovered in the ’80s.

Moulded Winglet/Sharklet
Add-On Winglet/Sharklet

Known as Winglets on Boeing airplanes and Sharklets on Airbus airplanes, they both do the same job and come in various forms and designs.

Winglets act as pressure blockers. Their angle reduces the amount of air getting to the other side of the wing. On wings without winglets, high-pressure air circles around and goes to the top of the wing where it presses down on the wing causing drag.

With winglets, the air is forced up the side of the winglets, and when it circles around to the inside surface, it presses down on the side of the winglets instead of the wing. This reduces the effect that vortices have on the generation of lift as they don’t hit the wing directly.

This dramatically increases fuel efficiency.  

Raked Wingtips

Airplanes like the Boeing 777x and the 787 Dreamliner had their designers opt to eliminate winglets as they added more weight and are prone to flutter. Instead, they increased wing spans by adding extensions at the wing tips.

Raked Wingtips on This Boeing 787 Dreamliner – Source: pjs2005

These extensions were then angled backward as an integral part of the wing so that they have a larger sweep backward than the rest of the wing, and a pointier tip. Doing this isolates the vortices to a significantly smaller area of the wing and increases the distance between the vortex and the plane’s body.

These were proven to cause a significant reduction in drag on long-haul flights which these aircraft were aimed at.

The Boeing 777x also has foldable raked wingtips to be able to fit in airport gates. Its full wing span would have put it in the same group as bigger planes like the Airbus A380, which would make its use limited to airports that can support such big planes and incur higher airport fees for its operators. 

B777x Folding Wingtips – Source: Dan Neville

Once the aircraft has been pushed clear of the gate the wingtips are lowered and locked into place for the duration of the flight. Once in place, they form the same wing profile as the B787 seen above.

Larger Aspect Ratio Wings

Aspect ratio means the ratio between the length of the wing and the width across it. Larger aspect ratios, therefore, mean longer and thinner wings. These have been proven to dramatically reduce vortices. Such wing designs have been in use for a long time by gliders as they produce minimal drag.

With advances in technology, airplanes like the Airbus A350 and Boeing 787 are being manufactured with longer and thinner wings as compared to their predecessors. The materials and processes now used allow for the wings to be made in very different ways compared to the conventional airplane wing, allowing for these dimensions to now be achievable.

This comes from the theory that planes with infinitely long wings and no wingtips would not experience wingtip vortices. Longer wings, therefore, reduce the span-wise movement of air which causes vortices. 

Elliptical Wing Designs

Elliptical wing designs produce a varying amount of lift along the wing, with the most lift being produced in the middle where there is more surface area. The least amount of lift is generated at the tips as they have smaller surface areas, hence a smaller pressure difference. This causes smaller vortices and less drag.

Supermarine Spitfire – Source: Airwolfhound

This design was used in the British WWII Supermarine Spitfire but is rarely used anymore as the shape is harder to manufacture and reinforce without making it too heavy. Controllability on a large-scale wing also makes the wing shape a decision-breaker for engineers.

Learn More
Try These Articles:
* How Do Airplanes Handle Lightning Strikes?
* How Do Airplanes Not Freeze?

Flying Over the Pacific Ocean – Do Airplanes Do It?


Have you ever wondered why flying directly over the Pacific Ocean seems few and far between? You may have already gone on enough vacations to last half a lifetime, but you just can’t seem to recall traveling right across the Pacific waters, unless flying to Hawaii that is.

Most airplanes do not fly directly over the pacific but instead, fly a curved route hugging the shorelines of Asia and North America. Flights do cross parts of the Pacific Ocean when en route to places like Hawaii and the Cook Islands. Staying within safe flight range of land is always preferred.

We all know airplanes fly all over the world and pretty much no part of the planet is inaccessible so in today’s article, we’ll answer the question as to whether aircraft do fly over the Pacific Ocean and, if they do, how exactly they do it.

Source: Flightradar24

Do Commercial Planes Fly Over the Pacific Ocean?

Most commercial planes, when flying from Asia to the United States or vice versa, do not fly across the Pacific Ocean, but instead, fly within a few thousand miles of the continent’s coastlines. Flying a curved route is the shortest route around the globe providing for shorter, faster flights.

When looking at a 2-dimensional map of our world it looks like the most direct route between two points is a direct line drawn between them. On an actual flight, this direct line is a much farther route because the earth is a sphere that we can fly through, we must fly around its surface.

To find out exactly how this phenomenon works please have a read of this article I wrote for you:

Why Do Airplanes Fly in a Curve?

Commercial air traffic is all driven by saving money and the quicker a flight takes, the less fuel is burned and the more flights can be fit into a given time frame.

All aircraft flying over vast expanses of this planet have to abide by ETOPS (Extended-range Twin-engine Operational Performance Standards), a set of rules designed to regulate the distance that a plane can fly from a suitable runway.

ETOPS takes into consideration a plane’s size and ability, and the smaller a plane is, the more stringent the rules will be – especially when it comes to flying over the Pacific Ocean.

Basically, ETOPS allows an airplane to fly no more than 180 minutes flying time away from a suitable airport at which it can land. This provides a safe margin for pilots of twin-engined aircraft to reach and land a runway on just a single engine.

ETOPS has now been extended to 330 minutes for qualifying four-engine aircraft like the Boeing 747-8 and Airbus A380. They still need to be able to maintain a safe flight and landing if they lose 1 or 2 engines during their flight.

If flying out in the southern Pacific with airports not able to handle an aircraft of that size the safety of the crew and passengers onboard could be severely compromised.

Wake Island in the North Pacific

There are times however when airplanes do fly directly over the Pacific Ocean, well at least parts of it. When en route to islands from the continental mainland or hopping between islands you can regularly find aircraft of all sizes.

Islands large enough almost all contain at least a runway of some form to allow for tourism, trade, resupply, and emergency operations to service the island.

Learn More
Try These Articles:
* How Long Can Airplanes Fly For? – Top 10 Routes!
* Helicopters: Can They Fly Across an Ocean?

Why Do Planes Not Fly Over the Pacific Ocean?

Many different factors come into play when figuring out the reason why planes do not fly over the Pacific waters. They include route distances, cost considerations, mechanical and safety issues, and weather patterns. ETOPS and aircraft performance also dictate the route a pilot can be assigned or take.

Distance

Considering how turbulent a flight over the Pacific Ocean can be, it would make sense for any plane to just steer clear of it. But planes do still brave crossing over the Pacific waters, and these are the ones that have no other route to take.

The truth is that when flying directly above the Pacific Ocean, following a curved route allows a plane to fly a shorter distance than if it took a straight path. The earth is a sphere, after all. Not a flat surface. This is why it’s easy to get confused about distances when looking at a flat map. In real life, curved routes win in terms of letting commercial planes fly faster and more efficiently.

If you can get hold of a string and a globe, you can perform an experiment on curved routes versus straight routes. Choose two locations on the globe, create a straight route between them with your string, and measure the distance. Then perform this process again, but this time make a curved route with the string.

After this experiment, you will see how a curved route does cover a shorter distance compared to a straight route. Airplanes that cannot meet the ETOPS performance standards or carry the required emergency equipment on board for ditching must pick an alternative route.


Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

Cost

A plane’s fuel consumption determines how much it will cost to travel to a particular destination. It is no wonder then, that airlines will go to great lengths in taking the shortest route possible.

A shorter route equates to less fuel consumption, which also means lower costs.

Safety

Being able to land in an emergency is always at the back of airlines’ minds, which is why they prefer air routes that let planes fly closer to land.

This is especially true for flights that can take up to 12 hours, which is how long a plane will have to fly over the Pacific waters when heading to Asia from North America.

Mechanical issues are another concern for airlines in establishing their routes. Engine failures during flight have to be taken into consideration, so it would be wise for a plane to be in the vicinity of land surfaces with landing strips or airports suitable to accommodate the aircraft.

When commercial planes fly, they usually go over Alaska and Canada as they take a curved path in the northern direction. Because going this route keeps them from spending a long time above the Pacific waters, they have more time left for an emergency landing when necessary.

Weather

Because it is more likely for storms to occur over bodies of water than on land surfaces, airlines plan most of their flights to spend the least amount of time over the Pacific Ocean.

Pacific waters are known for turbulent weather and thunderstorms, making it unsafe for a plane to fly over in the first place.

Planes would also much rather avoid flying through storms than experience turbulence and as a result, cause discomfort to their passengers. Lightning strikes are another issue that planes will want to avoid dealing with.

Jet streams, which are west-to-east air currents circling the earth’s surface, is yet another issue planes will have to deal with when flying across the Pacific Ocean.

If a plane happens to fly against a jet stream, it is more than likely to experience turbulence as well as aircraft damage.

Learn More
Try These Articles:
* How Do Airplanes Handle Lightning Strikes?
* How Do Airplanes Not Freeze?

How Fast Do Airplanes Fly? Climb, Cruise & Descent


Flying for any amount of time can soon get boring so the faster it takes the better. Have you ever wondered if pilots fly planes at their maximum speed or are they limited like we are driving a car down the highway? We all know airplanes are fast, the question is though, just how fast?

At takeoff, most passenger jets are traveling around 150-180knots/170-210mph. They will then climb at a maximum speed of 250kts/290mph while under 10,000 feet and then can speed up to 280-300kts/320-345mph for the rest of the climb. Cruise speeds of most passenger jets are around 600kts/700mph.

To find out all about the different speeds an airplane flies at please read on…

Large Commercial Aircraft Speeds:

What is an Airplane’s Speed at Takeoff? 

Most commercial airliners use three different speeds for takeoff. These are: V1, VRotate and V2. For the Boeing 737-8 or the Airbus A320 family, these speeds are in the region of between 125knots (143mph) to 175knots (200mph).

V1 Speed:

The V1 or Decision Speed is the speed pilots calculate to know what is the maximum speed they can reject the takeoff. This speed depends on the weight of the aircraft, humidity, outside air temperature, weather, condition of the runway, length of the runway etc.

V1 speed is usually around 140knots +/- 5 knots (Around 160mph)

Vr Speed:

The Vr or VRotate Speed is the calculated speed at which the pilot flying (One pilot manipulates the controls while the other monitors the instrumentation) pulls back on the yoke or stick to lift the aircraft off the ground. Vr Speed is always equal to or higher than V1, but it can not be lower.

Vr Speed is usually also around 140knots +/- 5 knots (Around 160mph)

During Takeoff One Pilot is Flying, the Second is Monitoring

V2 Speed: 

The V2 Speed is the speed of the aircraft at 50 feet above the ground. This is the speed the aircraft uses to climb to at least 400 feet above the runway and it’s always 5 knots greater than the Vr speed. In case of an engine failure on takeoff the V2 speed will keep the aircraft safe and on a shallow climb while still avoiding obstacles.

V2 speed is usually also around 145knots +5/-0 knots (Around 166mph)

What is an Airplane’s Speed During the Climb? 

The speed of an airplane during its climb varies greatly with the wind and the weight of the aircraft, but all aircraft must abide by maximum airspeed limitations set forth by the world’s aviation governing bodies.

From liftoff up to 10,000 feet above Mean Sea Level (MSL), all pilots must NOT fly their airplane faster than 250knots or 288mph, unless they request to do so with air traffic control. This speed limit is to help air traffic controllers control the flow of aircraft into and out of airports below.

This slower speed also allows for more power to climb faster allowing the airplane to quickly climb through the busy airspace surrounding each airport. Above 10,000 feet the pilots are allowed to speed up so their speed usually increases to 280-300knots, but in doing so their rate of climb will reduce.

Once passing around 24,000 feet MSL pilots will then speed up again to around 350-430knots (400-500mph). This slows the rate of climb again but improves the time taken to complete the flight. This configuration allows for a steady climb up to cruising altitude while flying at a fast enough speed to ensure the passengers get to their destination in a reasonable time.

The faster an airplane flies, the slower it climbs. Engines can only supply a set amount of power so pilots have to select which flight regime they take.

Think of it like towing a trailer with a truck. On the flat road section, you can flatten the accelerator and your truck max’s out at 100mph. You then come to a hill and still with your foot to the floor your truck can now only climb at 80mph while towing. This is the same with the airplane.

Learn More
Try These Articles:
* How Much Do Airplanes Weigh? (With 20 Examples)
* This Is Why Pilots Reduce Thrust After Takeoff?

What is an Airplanes Cruise Speed? 

The speed of a typical airliner in cruise is usually up to 600kts/700mph/960kph. In the cruise, the pilots use the airplane’s Mach Number for controlling its speed as this number is not affected by atmospheric pressure at cruise altitudes.

What is the Mach Number? 

It’s basically the speed of the aircraft expressed as a percentage of the speed of sound (666 knots/766mph/1233kph). Controlling an aircraft by the Indicated Airspeed(IAS) at high altitudes is not efficient because the IAS is decreasing with increasing altitude and is also dangerous for speed control since the aircraft might find itself in an overspeed or underspeed condition.  

As you can see in this picture, in the left top corner of the right-hand screen, .77 is the selected Mach Number which results in a 244knots IAS.  

The Ground Speed on the other hand, as seen on left-hand screen, top left corner is well over 410knots or 500mph/900kph. 

Think of speeds like this:

  • Ground Speed is the speed the airplane’s shadow is moving over the ground
  • Indicated airspeed is the speed of the airflow hitting the nose of the aircraft

The arrow in the top left corner is showing the wind outside. In relation to the aircraft, the wind is blowing from the pilots’ 10 o’clock position at about 27knots. This makes the airplane fly slower because it is a headwind.

If the wind was blowing from behind the aircraft this is known as a tailwind and will give the airplane a push resulting in a faster speed over the ground for the same indicated airspeed.

Usual cruise speeds are in the region between 400kts/450mph to 560kts/650mph and it is greatly affected by the wind.

The stronger the tailwind, the faster the airplane moves over the ground, the stronger the headwind the slower the airplane moves over the ground for the same indicated airspeed.


Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

What is an Airplane’s Speed During Descent? 

The speed on the descent is somewhat like the climb speed. Initially, the aircraft descends from its cruising altitude by the pilots changing its Mach number. The slower the speed, the less lift the wings produce and gravity does the rest.

Once the airplane passes through 29,000 feet the pilots start using the Indicated Airspeed again.

Ground Speeds during the descent usually vary between 345kts/400mph to 435kts/500mph depending on if the airplane has a headwind or a tailwind.

Passing through 10,000 feet MSL, the same Air Traffic Control restrictions apply as the climb, so the pilots have to slow down to a maximum of 250knots (300mph). Ground speeds again vary between 300mph to 400mph depending on the wind.

What is an Airplane’s Speed at Landing? 

The landing speed of a commercial airliner is greatly affected by the actual weight of the aircraft. The higher the weight, the higher the speed needed. More lift is required for the heavier load. To get more lift the airplane needs to be flying faster.

The typical speed region at landing for a large airliner is usually 120kts/140mph to 155kts/180mph.

What is an Airplane’s Speed During Taxiing? 

Since we are talking about speeds in flight it would be appropriate to at least mention the speed of aircraft on the ground. Aircraft inside the apron usually taxi with 10 mph maximum. Outside of the apron, this speed is increased to a maximum 30 mph.

The apron is the area immediately surrounding the terminal gates and where ground personnel are scurrying back and forth servicing the waiting aircraft. Once the airplane gets out onto the less busy taxiways the pilots can then speed up.

Light Aircraft Speeds:

Although the skies are dominated by the ‘Heavy Iron’, there is a tonne of light aircraft flying around and they too have certain speeds the pilots have to maintain to ensure a safe flight.

Light aircraft like the Cessna 172 or the Diamond DA40 only use one speed – The Indicated airspeed. They do not have the need for V1, Vr, or V2 like large commercial aircraft do, simply because they only have one engine, plus they are not going that fast.

What is a Light Airplane’s Speed at Takeoff? 

The takeoff speed for light aircraft can be as low as 45mph. One of the biggest things affecting the takeoff speed of a light aircraft is the size of the wings (wing span) and the engine power. Both can significantly decrease the takeoff speed.

Large wings produce lots of lift meaning the aircraft needs less airflow over them to get airborne.
Powerful engines mean they can accelerate the plane to lift off speed in a much shorter distance.

Typically most small aircraft lift off around 60mph. This gives a good buffer between the power it can produce and its stall speed.

The stall speed is the airspeed at which there is not enough air flowing over the wings to lift the aircraft into the air. An aircraft stalling close to the ground usually ends in a wreckage of the aircraft.

What is a Light Airplane’s Speed During Cruise? 

Cruise speeds for most light aircraft vary between 70mph to 120mph. The Cessna 172 has a cruising speed of 110knots (125mph). If you have ever flown in one you would know that it is not at all about the speed in a light aircraft but the convenience and freedom it provides.

The larger the airplane, the more power its engine can produce which also allows for a faster cruise speed. Some light aircraft are designed specifically for a fast cruise to get its occupants from point A to point in the shortest amount of time, whereas some aircraft are designed to be easy to fly and land.

What is a Light Airplane’s Speed at Landing? 

The landing speed for a light aircraft is usually the same as takeoff speed. Between as low as 45mph to 80mph. Usually, a small increment is added on the approach to land speeds to have a margin from the stall speed and also have some extra speed in case of a go-around.

Some small airplanes are designed to be able to touch down with almost zero forward speed if they have a good headwind. There is a competition in Alaska to see who can land in the shortest distance and you will be amazed just how short some of these aircraft can do it!

Learn More
Try These Articles:
* How Long to Refuel an Airplane? – 15 Most Common Planes
* How Do Pilots Know Where to Taxi Around an Airport?

Why Do Planes Fly at Different Altitudes?


Have you ever seen the videos people take from the window seat of another airplane flying with them at a lower altitude or crossing below them? We all know airplanes fly high but why are all the airplanes flying at different altitudes?

Airplanes are flown at different altitudes based on the direction of flight, wind speed & direction, and traffic flow. The height of each flight is selected by the airline’s flight planning department to burn as little fuel as possible. The pilots and air traffic control then try to accommodate each request.

There is a method to the madness and to try and fit in as many aircraft into a given airspace the air traffic control system has some rules and guidelines that they use. One of those is altitude.

Commercial passenger jets generally fly at an altitude between 30,000 and 40,000 feet. There are several reasons why pilots would want to fly their planes at such altitudes but by far the main reason is the air becomes thinner as the altitude gets higher. This produces less drag allowing the plane to fly faster while burning less fuel. 

Engine manufacturers develop their engines to run at optimum fuel efficiency in this altitude range. As you can imagine, every airline wants their planes flying in that range!

For an aircraft like the Boeing 777-300ER on a cross-continent, 15 hour flight, there are a large number of variables to consider, some of which can change rapidly and may have a big impact on the flight and its fuel consumption. 

Here are a few key factors that determine the altitude at which a plane will fly:

Fuel Efficiency

By far the biggest reason for the high altitude that a plane should fly lies in fuel efficiency. The thinner air creates less drag on the aircraft, which means the plane can use less fuel to maintain its speed. 

However, the jet engines also need oxygen to work, since they need it for optimum combustion. So, flying too high can reduce engine efficiency as it will burn more fuel. There is that perfect altitude for that flight leg based on the current atmospheric conditions and weight of the airplane that will burn the least amount of fuel.

Avoiding Air Traffic and Hazards

The first reason is higher altitudes mean that the pilot can avoid birds, light aircraft, and helicopters, which all fly at lower altitudes. This is one of the reasons why airplanes seem to climb at a very steep angle as soon as they lift off from a runway.

The second is traffic separation. The main job of the air traffic controller is to maintain separation between aircraft. With over 45,000 planes taking flight in the U.S. every day and 5,400 in the sky at any given time it is a busy place above our heads.

In the US, the air traffic control service is provided by Federal Aviation Administration. It is managed by 520 airport traffic control towers and en route centers manned by over 14,000 trained air traffic controllers. Coordinating many arrivals, departures, and flights without collisions requires precise planning and air traffic management. 

To help keep traffic separated, air traffic controllers can separate aircraft using different altitudes. Aircraft flying below 29,000 feet should have a vertical separation of 1,000 feet and above this separation increases to 2,000 feet. 

This is why you may see an aircraft cruising below you when you look out your airplane window. They seem a lot closer than 2,000 feet but up in the air this can seem really, really close!

Weather

The weather has a significant impact on flying. To avoid weather anomalies, commercial passenger jets normally cruise above the Troposphere, to avoid any weather events like rain, snow, and thunderstorms as they are generally concentrated below.

The Earth’s Atmospheric Layers – Source: Marco Saporiti

A bumpy ride is unpleasant to travelers and pilots try their utmost to avoid air streams that may cause turbulence to the aircraft. When planes run into air pockets, strong winds, and heavy clouds, pilots may request a different altitude which the air traffic controllers may grant depending on the air traffic around the aircraft. 

Ensuring a smooth ride is usually the second factor after fuel conservation that airlines pay close attention to. Turbulent rides make passengers nervous and scared and it can cause injuries to flight attendants when trying to move about the cabin serving refreshments.

Tailwinds, Headwinds 

A tailwind is a wind that blows in the direction of travel of a plane, while a headwind blows against the direction of travel. A tailwind increases the plane’s ground speed (The speed of the plane’s shadow moving across the ground) and reduces the time required to reach its destination, while a headwind has the opposite effect.

Let’s assume your airspeed is 100 knots. A tailwind of 20 knots will give you a ground speed of 120 knots. But a headwind of 20 knots will reduce your ground speed to 80 knots.

In the winter the jet stream dips down over North America. That is why it may take 6 hours to fly from JFK to SFO but only 5 hours on the return flight from SFO to JFK. This is headwinds and tailwinds in action.

Pilots prefer to have tailwinds while cruising and may request a different altitude that has a better tailwind to help fine-tune their fuel burn. Again, it will be up to air traffic control to accommodate this request.


Join My Newsletter & Get Great Tips, Information and Experiences To Help You Become a Superb Pilot!

* indicates required
Your Interest: *

Designated Cruising Altitudes

For smaller aircraft that wish to or need to cruise below 18,000ft MSL (Mean Sea Level) the FAA has set rules of altitudes the pilot must choose to fly at based on the magnetic heading they are flying. This is known as an IFR Cruising Altitude and once they pass above 3000 feet the pilot must obey this ruling:

For pilots flying Eastbound on a heading between 001° to 179° magnetic they must fly at ODD Thousands of feet – 5000ft, 7000ft, 9000ft, 15000ft etc

For pilots flying Westbound on a heading between 180° to 360° magnetic they must fly at EVEN Thousands of feet – 4000ft, 6000ft, 10000ft, 16000ft etc.

Learn More
Try These Articles:
* Why Are Airplane Engines So Expensive?
* Why Do Airplanes Fly in a Curve?

Why Do Planes Fly So High?

Commercial Airplanes are flown between 30,000 & 40,000 feet because drag caused by friction of the air on the fuselage is minimal. It requires less power to propel the plane through the air resulting in less fuel burned. Fuel is the biggest operating cost for an airline and any reduction is welcomed.

Although the thinner air improves flight efficiency, there is a point at which the air becomes too thin which results in engines not getting enough oxygen. Less thrust means that the wings are not producing sufficient lift. It is also difficult to restart an engine at a higher altitude, in the event of its failure due to the lack of oxygen.

The highest an airplane can fly is known as its service ceiling. Just like any factor in aviation, a buffer is placed in between what is the normal cruising altitude and the service ceiling to ensure safety is maximized at all times.

Here is a table of service ceilings of the world’s major commercial aircraft: 

AircraftService Ceiling (feet)
Airbus A32041,000 
Boeing 75742,000
Boeing 73737,000 
Boeing 737 – Max41,000
Embraer E-jet41,000
Airbus A33041,100
Airbus A34041,450
Airbus A350-90043,100
Airbus A38043,000
Boeing 747-40044,947
Boeing 747-843,100
Boeing 77743,100
Boeing 78743,100
Gulfstream G650 51,000
Concorde 60,000

Some Aircraft Can Fly Higher

Smaller, private jet aircraft have more capabilities to fly higher. Many smaller corporate jets are rated to ceilings of 51,000 feet. For commercial passenger aircraft, the out-of-service Concorde was by far the champion, cruising up to 60,000 feet, and military planes, especially reconnaissance planes such as the Lockheed U-2 can fly up to 70,000 ft.

Lockheed U2 Reconnaissance Jet

Smaller fuselages allow for higher altitudes because they can be built stronger to withstand the pressure difference between the inside and outside of the airplane. The engines are also smaller and are designed to operate at higher altitudes to allow biz jet manufacturers to get the greatest range out of their planes.

The range is one of the biggest selling features on most small jets.

Learn More
Try These Articles:
* Can a Commercial Plane Fly to Space?
* How Do Pilots Know Where Other Aircraft Are?