<human>:  How do airplanes stay in the air?
<bot>: Airplanes stay in the air due to the lift generated by the wings. Lift is a result of the aerodynamic forces created when air passes over the curved surface of the wings. As air passes over the wing, some air travels faster than the air below it, creating a pressure difference. This low pressure area over the wing causes the wing to be 'lifted' upwards, allowing the airplane to fly.