How does plane fly in the air?

If you look at the typical airplane wing, you will notice that the bottom is relatively flat as opposed to the top of the wing that is curved. As the wing goes through the air, the air on top of the wing must travel faster relative to the air on the bottom of the wing. This create a low pressure vacuum on top of the wing. That vacuum creates lift, and enables the plane to sustain flight. This behavior is the Bernoulli principle. As the wing angle is increased, relative to the air it's going through (called Angle of Attack), it will increase lift, at least to a point. When a wing angle of attack becomes to high, the air above the wing becomes too turbulent and the wing will then "stall" (stops producing lift).