Why don't aeroplanes fall to the ground?

The wings of an aeroplane produce liftÂ?which keeps the plane in the air.

For every action, there is a reaction. There is a large amount of air being forced down by the wings. After the air flows over the top of the wing, due to the shape of the wing, that air also flows downwards, creating an upward force on the wing. Thus, the opposite force would be the air keeping the airplane up.