Question

if gravity acts on every object on earth then how aeroplane fly

Answer 1

When an airplane flies, it must first overcome two primary forces--weight and drag. Weight is the force of gravity acting to pull the plane to the ground, and it is overcome through lift. Lift results in the plane rising into the air.

Answer 2

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the gravity acts on every object on earth it's true .
but, your question is that why does the plane fly so, the gravity works on everyone but, if there will be high speed or velocity in that case the gravity will not work properly ,as we know plane flies so faster . if any object moves in high speed that gravity does not acts