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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Headwinds are actually very useful in certain circumstances. When taking off or landing, the aircraft will do so at the side of the runway opposite to the wind direction so that it will have headwinds, so that effectively it will have more airspeed. Actually doing it with tail winds is rather dangerous, exactly because the wing takes away from your airspeed, reducing your lift at the same ground speed, making both takeoff and landing rolls dangerously long.
But when you are in cruise, it acts against you, because it slows you down relatively to the ground.
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