[skyking]

I too have instructed that gem. After many years of aircraft flying and ownership, I can tell you the bare truth:
The 4 forces of thrust and drag and lift and weight, Bernoulli Effect, even your little tale about directing air downward, none of these make a plane fly.
It has been proven that the wallet is indeed the necessary force. Remove the wallet and the plane falls out of the sky like a toolbox with a broken handle.