Thats different though becuase that is a propeller plane. The propeller is used to pull air toward it. The question is what i am getting at. If you put a Boeing 747 in a closed huge facility with no wind, then placed it on a mile long belt then tried to get it to move it would stand still. The question states that if the belt could match the speed on the plane for every increase then the plane would sit in the same spot. EVEN though the thrust is pushing the air, there is no wind under the wings to pull the wheels off the ground, so there for the plane is being guided by its wheels. If the thrust pushes the plane forward on a runway then the plane would speed up to the point where there was enough lift under the wings to get it off the ground. But in this situation there is no lift under the wings so there for the wheels are holding the plane to the ground. So really the belt is moving at the same speed on the thrust which the wheels are holding that thrust to the ground so there for it wouldnt go anywhere.

But this situation is impossible becuase if this was possible the wheels would overheat and blow long before it could be tested.