there were 4 planes not 3, 2 destroyed the twin towers 1 destroyed the pentagon and the 4th one crashed in pennsylvania cuz the passengers fought the hijackers, no one knows were the 4th plane was supposed to crash at besides the 19 middleeastern hijackers maybe the 4th plane waz supposed to crash at the white house but again we don't know its called 9/11 cuz it happened on september 11 2001!!!!!!