On Oct 9, 6:15 pm, Randy Poe wrote:
(2) Conservation of momentum (for every action there's
an equal and opposite reaction) says that you can't push
up from the inside. You'll create a counter force pushing
down.

Finally, someone speaks reason.

Now all we need to do is see that the jar might as well be a the
volume of a wing, and the same principle applies.

Not possible to have air on inside of wing pushing up against
underside of top of wing without having same said air pushing downward
on overside of bottom part of wing.

-Le Chaud Lapin-