<human>:  How does an airplane work?
<bot>: An airplane is a form of aircraft that utilizes wings and a propulsion system to generate lift and thrust to move through the air. Airplanes rely on four forces to fly: lift, weight, thrust, and drag. Lift is created by the wings as the airplane moves through the air and is the main force that keeps the airplane in the sky. Weight is the force of gravity that pulls the airplane towards the ground. Thrust is created by the engines and is the force that moves the airplane forward. Finally, drag is the resistance created by the air as the aircraft moves through it. The combination of these forces allows the airplane to stay in the air and move in the desired direction.