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Plane not fly in water, plane fly in air.
WRONG
Air is a liquid, water is liquid, so you can fly a plane in the water are you stupid?
You're right, relative density and the chemical composition necessary to oxidize fuel combustion definitely are irrelevant, thanks for reminding me!
Air behaves like a liquid... air is a gas.
Maybe this was a joke, but I'm unfortunately now required to ask whether you're stupid.
Air behaves like a fluid. "Fluid" doesn't necessarily mean "liquid"
And the comment replied to specifically claimed air to be liquid, which it is not at typical temperatures and pressures.