Question

earth has gravity how do aeroplans go up?

Answer 1

aeroplane have engines(the 4 fans you see on the wings are engines) which suck the air and push them verforce fully backward(this can be upto 400km/hour) as newton 3rd law of motion suggest aeroplane will go forward and as a result air passes from top and bottom plane differently which create a pressure differencce and this pressure difference lift the aeroplane