think about this...

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SOLVED!!!11

the plane will take off if the conveyor belt gets fast enough. saying that there is no air flow over the wings is retarded. the conveyor belt causes viscous drag on the air above it, and forces the air over the wings corresponding to a velocity profile that is in chapter one of any fluid dynamics book.

it's the same reason your canoe slows down after you row it. if the conveyor belt is acutally going 3000 mph relative to the plane, the air speed right at the edge of the belt is also 3000 mph relative to the plane. (that is a fact, don't debate it.) this speed drops off drastically, but it might be 100 mph by the wing. which would create lift, and the plane would take off and instantly be carried backwards unless it was producing trust of its own.

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The problem with this is that the wind speed would be drastically faster under the wing than it would be a few feet higher above the wing. Although it would be impossible to say for sure without knowing the exact shape of the wing, I have a feeling that this effect will create more downforce than lift.