On September 10, 2001, Hazmi, along with Mihdhar and Hanjour checked into a hotel in Herndon, Virginia. The next morning, Hazmi and four other terrorists, boarded American Airlines Flight 77 at Dulles Airport and hijacked the plane so that Hani Hanjour could pilot and crash the plane into the Pentagon as part of the September 11 attacks. The crash killed all 64 passengers aboard the aircraft and 125 in the Pentagon.