Here is a five minute presentation of everything you always wanted to know about 9/11.

(Oh, and as for the plane flying into a building, about a year before 9/11, the emergency services in Putnam, Westchester, and other counties just north of New York City, had a drill in which a plane flew into a building, in this case a school.  The drill was held just outside of West Point.  As a member of a n ambulance corps in that area, I participated in that drill.)

http://www.youtube.com/watch?feature=player_embedded&v=yuC_4mGTs98