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How does an AIRPLANE FLY ?

Flight is basically a battle against Earth's gravity, and your greatest ally is the air. Birds and planes, alike, fight gravity by manipulating the air molecules around them. When birds flap their wings, they're generating an area of high air pressure under the wing and low air pressure above it.
The same happens when planes race down the runway. The pressure difference above and below the wing creates a net upward force, giving the aircraft lift. Once this upward force exceeds gravity's downward pull, you have liftoff! Of course, a 1 million-pound plane needs greater lift to get off the ground than a great bustard.




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