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Taking off requires acceleration to a sufficient speed for the plane to be lifted by the air; acceleration takes a lot of energy, maintaining speed takes less energy. Landing is complex because the plane has to maneuver into exactly the right position and speed in order to land on the landing strip, so that also consumes energy. In principle, if you could land anywhere at any speed (for example, if you were crashing into the ocean) that doesn't require any energy because gravity does it for you. But that's not how planes normally land.

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