You can't use the venturi effect to create a vaccum. What we might do is have to opposing pistons, one using the compressed air to have the other piston create a vaccum.

As for the airplane debate, I think it's the bernoulli effect. Or at least that's the most important component. The angle of attack does make a difference though but it's important with the wing shape, that's what the Wright brothers figured out. The curvature of the surface of the wing has low pressure, the bottom end has high pressure. Since you've got a plane with wings that have a large surface area, you've got a lot of lift force overall. The important part to lift is airspeed. If planes relied entirely on angle of attack, then in theory, your flaps that angle down would make the plane lift up on landing. (not too sure about that)