>>14 and
>>11
OK, but this is a conceptual problem, not a practical one (I've yet to see a plane on a treadmill), therefor, friction on the wheels and things like resistance between the wheels and the plane are irrelevent. Conceptually, the plane will fly. In real wolrd application, the plane would still fly, but the 'mill will only have a small affect on the plane (i.e, the resistance of the wheels to the plane will add only a little counter-force to the plane).