I have been trying to figure this out right along. Even 9/11 would have not been explained as terrorism if there had only been one plane involved. No group to this day has come forward to claim responsibility for 9/11 so if it had only been one plane an accident would have been ruled and we would have went on as usual. Now we have high alerts but then when something happens the FBI is right there to deny terrorism before all of the facts have even been revealed.
Flight 587 and flight 800 along with a lot of other unexplained "accidents" are no doubt in my mind the acts of Muslim terroists.
You forgot all the phone calls they allowed and/or encouraged from the plane. FAA knew that the plane had been hijacked before it hit the tower. They even had a description of the hijackers.