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A Jet engine contains a series of turbines that accelerate the air that enters the engine. As the air is accelerated it is compressed to a higher density at which point the fuel is able to begin combustion at ambient temperatures. As the engine warms it becomes more efficient as the fuel is pee heated and the compressor is able to spool faster. At higher altitudes the engine becomes more efficient as the initial air density is lowered causing less resistance on the turbines to accelerate the air, thus allowing a higher spool rate with less fuel. Jet engines are very inefficient at sea level when compared to their efficiency at cruising altitudes.

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