Deemar said in post number 20 of this thread--
2) In order to deflect an airstream, you need to have a pressure gradient across the airstream. To deflect the airstream downwards the pressure above the airstream needs to be higher than the pressure below.
That seems to contradict the follow on statements that the wing creates a low pressure above and high pressure below.
How could a low pressure above a wing promote a mass flow down toward a high pressure area?