the jet engines create thrust and when there is enough thrust or speed, the airplane takes off because of the airfoil shape of the wings which makes low pressure on the top of the wing and high pressure on the bottom.
Jet planes fly with the help of Thrust and Lift produced by the jet engines.
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It isn't a matter of why they need it! Some planes are just designed with jet engines! Jet engines take a small amount of air and push it out fast whereas props take a large amount of air and push it back slower! Some planes just have jet engines!
Ordinary jet engines are used on aircrafts. But some planes require turbojet engines. These planes fly at more than the speed of sound. There are other type of airplane types too.
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jet engines require air, compression, and combustion to make it work
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)
yes Most airplanes other then gliders need fuel to fly some planes run on normal internal combustion engines and others run on jet engines but they all require fuel to operate them.
Yes, jets are planes but jets are mostly known as supersonic planes.
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You have to have at least one. (If you don't have an engine, your are classified as a glider.) The largest planes typically run 4 or 6 jet engines. Most planes have 1,2,3,4 or 6 engines. Very large aircraft sometimes have more. There are propeller planes, turbo prop and jet engines. There are also VTOL Vertical TakeOff and Landing planes, such as the Harrier and Osprey