What causes plane to fly?

Answer 1

Aeroplane wings and flat at the bottom but curved at the top, as they move through the air, it will flow normally under the flat part of the wing and up and over the curved part of the wing. This causes air to flow faster, and causes higher pressure, The low air pressure under the wing then attempts to flow into the high air pressure above the wing, pushing the wing upwards in the process. This causes the plane to fly.