I have learned so much about 9/11 like,there were 4 planes that were hijacked, but only three planes flew into the place they planned to go. The fourth plane was hijacked but then the passengers started getting calls from family members say three other planes have been hijacked .Sooner, or later they figured out they had been hijacked but that day the people on that plane became Heroes. They took over the plane but they they had no choice but fly the plane into a felid in pennsylvania.