I just don’t understand. Whole purpose of engines is to push the plane and get the air under and top of wings, right? So we already have air coming to plane, why is it bad?
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I assume you’re just talking about cruise flight. Think of it this way: you’re traveling in a mass of air. If the mass of air you’re traveling in is moving backwards compared to the direction you want to fly in, it is like walking the wrong way on a moving walkway, or rowing upstream in a river. You will get there eventually but it will take longer.
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