The fifth plane was likely grounded before it was able to take off.
There's a number of rumors swirling about the Sears Tower.
I'v also read about that 5th plane on Sep 11th. Did anyone else read that story. There were 2 Arabs who were on a Plane in JFK airport in Queens NY. This was about 9 30 am. The 2 planes already crashed in the WTC. Apparently, they caused a fuss on the plane and people got suspicious of them. The 2 Arabs then got off the plane. Alot of people said that was the 5th plane to be hijacked.