the four aircraft hijacked that day, Uniled 93 the only one that did not reach its target. It crashed near Shanksville, Pennsylvania at 10:03 AM. No one survived.Military commanders were not notified that United 93 had been hijacked until four minutes after it had crashed. The nearest fighter jets were 100 miles away. At 10:18 AM, the president authorized the military to engage hijacked aircraft. Fearing an accidental shoot down, military commanders chose not to pass the order to pilots in the air. At 12:0 6 PM every civilian airliner over America had been forced to land. Amidst an unprecedented military mobillzation, US airspace was closed until further notice.
the peoples on united 93 try takeover the hijackers and united 93 crash in Shanksville, Pennsylvania