You people just don't get it.....If the conveyor is matching the plane's speed, the wheels will just be spinning twice as fast as the plane is actually travelling. However, the plane will still be moving forward......Forward motion will give the plane the lift required to take off. You are all STILL hung up on the wheels vs the conveyor. There is a third force at work here....the engines. And, yet again, I'll say that the conveyor is not working against the engines AT ALL! The engines are working completely independant of the conveyor....