Fighter Jet?

Question:
why do they leave marks in the sky?? -===>

Answers:

Helicopeter flight?

I think its called a contrail. check it out on wikipedia- http://en.wikipedia.org/wiki/contrails...

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Can you take the ground course for flight school at one school and the flying hours at another?

A jet engine, like a rocket engine, is a reaction engine. It works by throwing mass in one direction and taking advantage of the reaction in the opposite direction. In the case of a jet engine, the engine burns fuel (like kerosene) with air from the atmosphere. The burning fuel heats and expands the air, and this hot air shoots out of the exhaust-end of the engine to create thrust.

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what it means PPL ...( about pilots)?

Because the air is laden with moisture from the combustion process and rapidly cooled to saturation after it exits the engine.

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