5:45 a.m.: Nineteen hijackers begin passing through security at various airports.
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7:59 a.m.: American Airlines Flight 11 takes off from Boston’s Logan International Airport, heading to Los Angeles with 92 people on board, including 11 crew members, 76 passengers, and five hijackers.
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8:15 a.m.: United Airlines Flight 175 takes off from Boston’s Logan International Airport, also heading to Los Angeles, with 64 people on board, including nine crew members, 51 passengers, and five hijackers.
8:20 a.m.: American Airlines Flight 77 takes off from Washington Dulles International Airport for Los Angeles, carrying 65 people, including six crew members, 53 passengers, and five hijackers.
8:24 a.m.: One of the hijackers on American Airlines Flight 11 accidentally calls ground control, alerting them to the attacks.
8:42 a.m.: United Airlines Flight 93 takes off from Newark International Airport for San Francisco, with 44 people on board, including seven crew members, 33 passengers, and four hijackers.