Lets invert the problem. Say you have a conveyor suspended over water, directly over your power boat. Your boat is on calm water and has a set of wheels overhead which remain in contact with the conveyor. [The conveyor in this example would work against the direction of the boat, just like the other works against the direction of the plane] If you try to accelerate the boat, and the conveyor spins against it, will you move forward?

Hint- the answer is yes.