I still stand by my original post. No where does the riddle say the aircraft is even running. It says it is "standing". If it is standing, and the conveyor moves according to the planes movement - then nothing is moving - the conveyor or the plane.

It will never move - as soon is movement is detected the conveyor moves keeping it back zero point. So the conveyor would crawl at a barely detectable speed.

The better way to word the riddle would be to ask if a plane landed on a conveyor the length of the plane running at the same speed as the ground speed of the plane - would the plane run off the conveyor?

Yes.

Its all about wind speed over the wing. Everything else is irrelevant.