I dunno. If I look at even a very simple diagram of the flow of air around a wing I see air deflected downward on the bottom and air accelerated around a curve

I dunno. If I look at even a very simple diagram of the flow of air around a wing I see air deflected downward on the bottom and air accelerated around a curve on the top. Both would be expected to produce a downward reaction force. Added: Or more Newtonish (no action at a distance), there is more upward vertical force contributed by the particles in both cases than downward force.