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They don't defy gravity. Gravitational attraction affects planes just like anything else. The wings of an aircraft generate lift which when the plane is going fast enough is a stronger force than the gravitational attraction of the earth. To do this the wings split the air flow going over it into an upper and lower part. Because the wing is curved it forces the air to travel further when it flows over the wing than when it flows under. The molecules of the air in the upper part are therefore slightly separated out from each other which creates a small vacuum effect. The wing rises to fill this vacuum pulling the aircraft up with it.

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13y ago

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