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Jet planes fly with the help of Thrust and Lift produced by the jet engines.
Not as a rule, although many are pilots.
its engines
Most commercial jet liners fly in the stratosphere. Some military aircrafts fly higher than that. Small planes fly lower than the jet liners.
The planes Edwin Aldrin flew were Jet planes, as he was a Air Force pilot for many years.
It really depends on what the size of the jets. The Airlines fly from 32,000 to 38,000 feet.Normal Jet Planes fly at about 30,000 feetMilitary Jet planes fly anywhere from 100 feet all the way up to 80,000 (Some do go higher but those are for special occasions)
stratusphere
Small planes fly at 100 to 200 mph. Airliners fly around 350 to 500 mph. Jet fighters fly faster.
Jet planes can be of many types and some perform better than piston planes.
because of weather phenomena
A large jet can get over 12 Kilometers