[meglamaniac]

Ok here's how I understand what Mark is saying (I'm prepared to be corrected!):

Imagine the plane is stationary at the end of the runway, but the treadmill is already moving. So the wheels on the plane are turning, but the plane itself isn't moving.

Now imagine the plane goes through normal takeoff proceedure and the treadmill speed stays constant. I think we can all agree that under these circumstances the plane would take off.

Now add in the treadmill matching the speed of the plane. The only way it would NOT take off is if the friction from the wheels (strictly the friction from the wheel bearings) as the speed of the wheels increases is sufficient to counteract the thrust of the engines. Which clearly isn't remotely close to being the case, or planes wouldn't take off anyway and wheels would be pointless.

So the plane takes off.

Am I right Mark?