No, you can throw it horizontally.

.... where it throws the air in the way down to get it out of the way.
Why down? Because the wing is going up, and below is where the (new)
room is.

If the Earth is pushed away, wouldn't that stretch out
the air molecules between the plane and the Earth decreasing
the pressure below the wing?

Not if the air is truly incompressible. There would be more air
molecules between the wing and the earth because the wing is up there
and not down here.

Jose
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