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There is no certain cruising altitude for a commercial airline. it depends on where they are flying and how long they fly. most airlines fly above 10,000 ft. the max altitude is around 41,000 ft.
No, the Tupolev Tu-144 was the only other commercial plane to date to fly faster then the speed of sound.
Better fuel economy. The air is thinner at higher altitudes.
1000 - 500 ft
The plane will fly at steady height and speed :)
45,000 feet
One of the main reasons is to conserve fuel. Airplanes can fly at any altitude and speed. However, airplanes generally tend to fly at high altitude to conserve fuel. This makes the plane more efficient and keeps the operating cost down. Of course, an airplane can not always fly at max altitude at every flight. It may have too much weight or the distance it travels may be too short. So there is always a trade-off as to how they will fly the route.
It depends what aircraft and what speed you are going
most commercial airplanes fly from 35,000 feet to 45,000 feet above sea level.
No insect can fly faster than a jet plane. The fastest flying insects can travel at 60-70 mph, about the speed cars travel on a highway. By contrast a commercial jet usually flies at over 500 mph.
Probably in a private plane but their is no commercial flight there.
Different models will fly at different speeds. Typical speeds for commercial aircraft are probably around a few hundred km/hour.