What's really sad (for the "can't fly" crowd), though, is that even a car, who IS powered through the tires, will move forward on the conveyor belt... His speedometer won't accurately show how fast he's moving, though, 'cause his tires will have to spin twice as fast to obtain the same true speed.

Case in point: your speedo is just a calculation of how fast your tires are rotating. It isn't necessarily reflect how fast you are actually moving. Do a burnout, and your speedo says you're going 30+ mph. The reality of it is, you aren't moving at all.

Moving is actual moving. Not angular velocity of tires. So if the plane is MOVING, then it is ACTUALLY MOVING... Guess the "can't fly" crowd doesn't understand what "Moving" means...