Why do planes not fly over mountains?

Clear air turbulence is hard to pick up on the radar, so difficult for pilots to spot, but high mountain ranges are breeding grounds for clear air turbulence. According to the Federal Aviation Administration, clear air turbulence is the number one cause of injuries to passengers and crew in non-fatal accidents.



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Routes with the most turbulence
  • New York to London. One of the most popular routes which experience turbulence is flying from New York to London (and also London to New York). ...
  • Seoul to Dallas. ...
  • Flying into certain airports near the equator. ...
  • Flying into Reno, Nevada. ...
  • London to South Africa.


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Severe turbulence can cause a plane to drop so suddenly that pilots temporarily lose control. But, again, that's not enough to crash the plane. That's not to say it's never happened. In 1966, human error and turbulence combined to bring a plane down over Mount Fuji.

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Most flights are intended to spend as little time as possible over water, since storms are more common over the ocean than on land. An aircraft would not be safe to fly over the Pacific Ocean due to the stormy weather and frequent lightning strikes that occur there.

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The maximum height that a commercial airplane is allowed to reach when they fly is 42,000 feet, as this is the universally approved maximum altitude. This max altitude for airplanes is known as the “service ceiling.” Most commercial air jets fly at such a high altitude because it is known to optimize efficiency.

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Thanks to the low visibility and undeveloped infrastructure, flying over Antarctica is extremely difficult. Specifically, because of the strong magnetic fields that surround the polar regions, navigating there, no matter how well-equipped the airplane is in terms of instrumentation, can be particularly challenging.

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The longest over water route in the world is the stretch between the U.S. mainland and Hawaii. Even between Hawaii and Tokyo there are alternate airports available, such as Midway Island (hence the name “Midway”). Going across the North Atlantic, alternates include Iceland and Greenland.

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Has a plane ever ditched in the ocean? 23 November 1996: Ethiopian Airlines Flight 961 (a Boeing 767-260ER), ditched in the Indian Ocean near Comoros after being hijacked and running out of fuel, killing 125 of the 175 passengers and crew on board.

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Most commercial airlines that travel between East Asia and the Americas avoid flying over the Pacific Ocean due to high costs and safety concerns, such as the risk of flying during stormy weather.

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Russia and Alaska are divided by the Bering Strait, which is about 55 miles at its narrowest point.

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Turbulence is a sudden and sometimes violent shift in airflow. Those irregular motions in the atmosphere create air currents that can cause passengers on an airplane to experience annoying bumps during a flight, or it can be severe enough to throw an airplane out of control. (The pilots) aren't scared at all.

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While pilots can't actually see turbulence, they often know what is coming up, thanks to reports from other planes, weather reports, and radar equipment. However, clear air turbulence (severe turbulence occurring in cloudless areas) can sometimes catch pilots off guard.

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At times like this, pilots will slow to a designated “turbulence penetration speed” to ensure high-speed buffet protection (don't ask) and prevent damage to the airframe. We can also request higher or lower altitudes, or ask for a revised routing.

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