It should be noted that the FBI has no clue who the (19) terrorists were. They originally posted the pictures, and then they started popping up alive. Then, the FBI said that they used aliases. FOIA requests showed no arab name on the passenger lists. It you look at Osama Bin Ladens wanted poster on the FBI web site, you will not see 9-11 on there. If you call the FBI, they will tell you there is not enough evidence to prove that Osama was behind 9-11.
I actually have doubts that there were any terrorists on the planes at all.