Here's how it works:

* Aerodynamics: The shape of an airplane's wings is designed to create lift. The wings are curved on top and flat on the bottom.

* Airflow: As the plane moves forward, air flows over the wings. The curved upper surface of the wing forces the air to travel a longer distance in the same amount of time. This means the air flowing over the top of the wing moves faster than the air flowing under the wing.

* Bernoulli's Principle: This principle states that as the speed of a fluid (like air) increases, the pressure it exerts decreases. Because the air is moving faster over the top of the wing, the pressure is lower on the top of the wing compared to the bottom.

* Lift: The difference in pressure creates an upward force on the wing, called lift. This lift force is what counteracts gravity and keeps the plane in the air.

Other factors:

* Angle of Attack: The angle at which the wing meets the oncoming air (the angle of attack) also affects lift. A steeper angle of attack increases lift.

* Thrust: The engines provide thrust, which pushes the plane forward and creates the airflow needed for lift.

* Drag: Air resistance opposes the plane's motion and is called drag. Engineers design planes to minimize drag.

In summary:

Lift is the primary force that keeps a plane in the air. It is created by the difference in air pressure on the top and bottom of the wings, which is a result of the airplane's design and the movement of air over its surfaces.