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Aeroplanes use aerodynamics to stay in the air.
When air moves across the wings of a plane at speed the air molecules hit the front of the wing. The wind is flat underneath but it is curved on top front the front to the back of the wing. As the air hits the front air passing over the top of the wing causes a vacuum the air below passes straight across the surface because its flat. By maintaining the vacuum across the top of the wing the aircraft is effectively sucked up into the air by the vacuum. The pilot has to control the air flow across the wings to keep the vacuum active. When a plane climbs and its nose (and therefore its wings) hit the critical angle the plane stalls. This is when zero air is now passing across the top of the wings to cause lift. The plane then starts to fall until the pilot is able to get the plane in to a slight dive to force air across the top of the wings again to cause life and stabilise the plane.
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