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Due to the "teardrop" shape of wings, the air on top of the wings moves faster than the air on bottom, which produces lift for airplanes. Lift is the force that pushes airplanes into the air. It is caused by a difference of air pressure explained by Bernoulli's Principle. Since airplane wings are curved on top, air moves faster on top than on bottom. This means that the air on bottom will have higher air pressure and will push the airplane up!