about 600mph at about 70,000 feet and 1,200mph at higher heights.
Yes, jets are airplanes but they are called supersonic airplanes.
Averages 370 knots
They eat cham chowder. Why?
Airplanes need a lot of speed to take off because they are not designed for vertical takeoff and are to heavy to do so.
Depends. There are airplanes that can fly as slow, or slower than a cheetah's top speed. But there are plenty of airplanes that will be several times faster than a cheetah. A regular passenger plane would Cruise at about 8 times faster than a cheetah.
Airplanes all have different speeds.
b747-200
Airplanes over the past 90 or so years have changed a lot. We have gone from small, propeler driven, fragile, all fabric and wood, 100mph top speed aircraft only able to reach 200 feet in the air at most, to all metal jet aircraft that can double the speed of sound at up to 60,000 feet up.
Speed, altitude, and cost.
Every airplane has its own speed limits. Most small and commercial planes fly below Mach (the speed of sound). Military fighters and some other planes, like Concorde, fly above Mach, or supersonically.
Helicopters can land on small ships, clearings in forest, on top of buildings etc. Airplanes can not do these things
Cruising speed: 528km\h for 1900D