[V]

lol i think its funny that this "debate" has gotten this far. The plane will move forward, it will take off. propellor or jet driven planes move upon the principal of a force acting upon the surrounding air, the status of the wheels does not matter.

say they are measuring air speed of the plane, we'll say 50mph just as an example, ok so now the belt is going 50 mph in the opposite direction, the planes wheels will now be going 50mph+50mph(or 2x the speed of the belt) so therefore 100mph forward. However the plane is still moving 50mph forward. True even at lower speeds which would allow for the acceleration to the speed needed for lift off.
Plane=1mph, belt=1mph, wheels=2mph .... overall movement +1mph
Plane=2mph, Belt=2mph, Wheels=4mph .... overall movement +2mph
...etc...
xP(plane)=xB(belt)=2xW(wheels) x=mph

just keep in mind that this "treadmill" will need to be the length of a runway at least to keep the idea of the belt vs wheels going, otherwise the plane will move right off it.

yeah i know no one will understand this...but oh well, keep thinking the plane will sit in one place. its like saying a jet engine car will have traction problems. lol