Quote:
The plane is moving through the air down the runway, as I read it.


The problem is that the conveyor belt would have to move at infinite speed.

1. The plane will never leave the ground until the wings provide lift.
2. The wings will never provide lift without air moving over them.
3. Air will never move over the wings unless the plane makes forward progress on the runway.
4. The plane cannot make forward progress on the runway if the runway is moving at the same speed beneath the plane in the opposite direction.

The problem is that this is impossible. You are essentially providing thrust with 0 resistence, causing the plane to accelerate to infinite speed, which is canceled out by the infinite speed of the conveyor runway. It's a silly thing to argue about because it cannot happen.
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~ John