The majority are limited to 10,000 or 12,000 feet (the height where you must use oxygen and/or a pressurized cabin).
That's not a law, and some people own aircraft that operate on the same rules as commercial airliners.
Most fly between 30,000 and 50,000 feet.
Jet airplanes fly at high altitudes because it is more fuel efficient. Flying at higher altitudes uses less fuel than flying at lower altitudes.
Because cats do not have the capability to fly airplanes.
Because people are not able to fly without a airplanes.
You are unable to fly airplanes, however you can fly helicopters.
most commercial airplanes fly from 35,000 feet to 45,000 feet above sea level.
Type your answer here... airplanes fly in the stratosphere to avoid weather problems
the cabin could explode or crack
Lift makes paper airplanes fly, just as it does real planes.magic
2,000 airplanes fly in the air each day.
They fly.
Airplanes fly, trains don't.