Video narration
How can a heavy airplane stay in the sky? Hold your hand out of a moving car window, and you feel air push against it. A wing makes that airflow useful: as the airplane moves forward, its shape and angle send air downward, creating an upward force called lift. The mystery flips. Four forces explain flight. Lift pushes up. Weight pulls down. Thrust, from the engines, pushes forward. Drag, air resistance, pulls backward. The engines do not lift the airplane; they create the motion the wings need. On takeoff, thrust and the wing's angle help lift exceed weight. In level flight, lift balances weight, and thrust balances drag. Small control surfaces adjust direction and balance, while pilots manage power and speed. For landing, they reduce lift and thrust. So how does a machine stay up? Its engines drive it forward, and its wings create lift to balance its weight.