Lift is NOT created by a difference of airspeed over the top vs bottom of a wing. Common misconception. Definitly that would create lift (or at least a preasure difference). For airplanes that's not what does create lift.
As Brian points out so adequately, your hand, or even a flat plate will fly. Try handling a sheet of plywood in a good wind. What creates the lift is the angle of the wind hitting the flat part of your hand, or that plywood, so that it is 'blown' back and up.
The back part is called Drag, the up part is Lift and the angle is called Angle of Attack.
Airfoils are designed to ballance (not always maximize) the Lift and Drag at certain Angles of Attack. As Hossfly explained, non symmetrical airfoils create lift at zero or even small negative angles because the angle is measured from a line between the leading edge and the trailing edge not the aerodynamic center line.