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The angle at which the wing meets the oncoming air is called the angle of attack, and by changing this angle, you can affect how much lift a wing creates.

If you tilt a wing upward, it creates more lift to a certain point. Tilting a wing up too much actually decreases lift because this can cause the plane to stall. Tilting it down will decrease lift. This is what happens when a plane pitches down, so as to land.