The system is like a clever version of a car radiator, but in reverse, keeping the air rushing into the engine hot on the inside, and cool on the outside.

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On most jet aircraft, hot air from the engines is routed through piping in the wings, tail and engine openings to heat their surfaces and prevent icing.

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Exhaust from the engine consists of harmless atmospheric air, cold enough to serve as air-conditioning on a hot day.

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