An aeroplane is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.
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For an aeroplane to fly it needs three things thrust lift and drag

Thrust moves forward it is provided by a jet engine, the area below the wings of an aeroplane has more pressure than the area above so that causes a lift, while for drag the wings minimize the friction by passing through air which causes a little drag. 
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