"All Paul is saying is that to view lower pressure on the top surface of the
upper wing skin as *PULLING UP* on the wing is wrong. It's more accurate to
say the higher pressure air inside the wing is *PUSHING UP* on it (the upper
wing skin) as regards the forces necessary to fly.

The air inside the wing has nothing to do with lift.  There are wings out there that have foam cores with no air inside.  If there is air inside the wing, and assuming it's at a higher pressure than outside, it's pushing evenly on all internal wing surfaces.  If it were true that higher pressure inside the wing pushes the wing up I should be able to stand inside a box and cause it to levitate by pushing against the top from the inside!  I recommend reading the discussion at:

http://en.wikipedia.org/wiki/Lift_(force)

Note that there is no mention of what is inside the wing.

Tom Gourley