9/11 was a tragedy. There was a total of 4 planes that we know of. The one that hit one of the Twin Towers, then the second one that hit the other Twin Tower, and the one that hit the Pentagon, and the last one the one that landed in a field in Pennsylvania and killed everyone in it. There is now a museum to show different things that where in and at the Twin Towers. Even though you hurt us our people did not keep the pain for long. You might have knocked us down but you did not knock us out!