terror of terrorism

September 11, 2001, the events which changed the world was happend. Internatinal terrorist group "Al-Qaeda" atacked The United State of America. They hijacked four airplanes at the same time. Two hijacked airplanes charged at World Trade Center,one airplane charged at Pentagon, and another it charged at ground. Every passenger were died. Why United Airlines Fright 93, one of the airplane which hijacked by Al-Qaeda, were clashed with ground? Why this airplane not clashed with goverment body? So, passengers stand against terrorist with no weapon! There brave saved The U.S. All American must not forget their brave.