Flight 93 and His Double

http://911review.org/brad.com/Woodybox/Plane_Swap_Over_Pennsylvania_Flight_93.html

“This article deals with the last ten minutes of Flight 93 over Pennsylvania and, encountering the same contradictions, uses the same methods to solve them. The available accounts on Flight 93 are contradictory concerning its radar status, altitude, and flight path while being in Pennsylvania airspace…

The best explanation: there were two different airplanes.”