IvorTheEngine t1_irqpkyt wrote
Reply to comment by LazerWolfe53 in TIL that passenger jet engines produce most of their thrust from fan at the front, not from the jet exhaust, and that this is called a high-bypass engine. by Rilot
And flying higher means the air is thinner, so there's less drag. So even if the engine is less efficient, the overall flight can be more efficient.
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