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 feet
Military Jet planes fly anywhere from 100 feet all the way up to 80,000 (Some do go higher but those are for special occasions)
Jet planes fly in the stratosphere, which is the second layer of Earth's atmosphere. This layer provides a stable environment for jet propulsion and allows for efficient flying at high altitudes.
Jet planes fly with the help of Thrust and Lift produced by the jet engines.
Planes fly at high altitudes because the thinner air reduces air resistance, allowing the aircraft to fly more efficiently. Flying at high altitudes also provides smoother air currents, less turbulence, and shorter flight times due to the ability to take advantage of jet streams. Additionally, being at a higher altitude allows planes to avoid obstacles on the ground and have more flexibility in choosing their flight path.
Jet airplanes fly at high altitudes because it is more fuel efficient. Flying at higher altitudes uses less fuel than flying at lower altitudes.
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Small planes fly at 100 to 200 mph. Airliners fly around 350 to 500 mph. Jet fighters fly faster.
Not as a rule, although many are pilots.
Jet planes normally fly in the stratosphere because the air is thinner at higher altitudes, which reduces drag on the aircraft and allows it to operate more efficiently. Additionally, flying at this altitude helps to avoid bad weather conditions and turbulence commonly found in the lower atmosphere.
A large jet can get over 12 Kilometers
because of weather phenomena