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As this lower pressure air flows above the wing (at very high speed) it creates a partial vacuum and, as objects, gases or liquids will try to fill a vacuum, the airplane wing "rises" into this partial vacuum. At the same time the high-pressure air beneath the wings is being pushed downwards, creating a pocket of higher pressure. Just as in a balloon when you inflate it, the air inside (which is at a higher pressure) pushes against the sides, so the higher pressure under the wings push against the wings, pushing them upwards. This, very basically, is what holds the plane up. But the plane must maintain a minimum speed through the air for this to take effect – any lower speed results in a stall, where the plane loses lift and thus height.
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