It was black/dark grey in color and smaller than a commercial plane as was claimed by plenty of eyewitnesses.
It seems to me that at least three out of the four planes on 9/11 were grounded; diverted. This is exactly what happened with Flight 93; it was diverted to Cleveland; the whole airport was evacuated and everyone had to walk home or hitchhike as agents wouldn't let them access their vehicles. There were no bodies found in Shanksville where Flight 93 was supposed to have crash. This is according to the medical examiner.
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