He was in a fucking class room while the plane hit.
1. Why the fuck would he go to a class room.
2. How more obvious could it be.
3. The goddamn building was ensured a couple month before the act.
I mean, how stupid do you have to be to not see it. They say the chances of a building colliding into it-self by the plane crash was 1 :100000(More then that) the chances of two building colliding into the same spot at the same day, is nearly impossible. The air-planes fuel was not hot enough to bring down the whole building, or melt the steal frame.