828;
In simple terms, lift, or the net force on the wing, is the result of the DIFFERENCE in pressures between the upper and lower surfaces. Hence, the upper surface could be at one atmoshere, and still produce lift if the lower surface is at more than one atmoshphere. But in most locations, the pressure on the top surface is less than the pressure on the bottom surface. So to answer 828's question, standing on this wing could be like standing in a wind slightly greater than the airspeed of the aircraft, at an altitude greater than the aircrafts altitude. On top of Everest, for example, or at Denver, depending on the speed, aerodynamics, pressures, etc. And perhaps on a slope since the wing has camber normally. Breathing as per the wind/pressure situation, gravity has basically the same effect. Hold on.
Hawk