For an airplane wing, between the top and the bottom of the wing there wasn’t really a difference in height but there was a difference in air speed. This speed difference caused a pressure difference, pushing up on the wing. For the same air flow speeds top and bottom, where would an airplane get the most lift?
all the same
Earth air density 1.29 kg/m3
Mars air density 0.020 kg/m3
Venus air density 67 kg/m3
Mercury air density 0 kg/m3