7:58 AM EST: United Airlines Flight 175, a Boeing 767, leaves Boston en route to Los Angeles with 65 people.

7:59 AM EST: American Airlines Flight 11, a Boeing 767, leaves Boston en route to Los Angeles with 92 people.

8:01 AM EST: United Airlines Flight 93, a Boeing 757, leaves Newark en route to San Francisco with 45 people.

8:10 AM EST: American Airlines Flight 77, a Boeing 757, leaves Dulles en route to Los Angeles with 64 people.

8:29 AM EST: American Airlines Flight 11 veers off course.

8:46 AM EST: American Airlines Flight 11 crashes between floors 96 to 103 of the North Tower (Tower 1).

8:47 AM EST: United Airlines Flight 175 veers off course.

9:00 AM EST: American Airlines Flight 77 veers off course.

9:03 AM EST: United Airlines Flight 175 crashes between floors 80 to 86 of te South Tower (Tower 2).

9:37 AM EST: United Airlines Flight 93 veers off course.

9:40 AM EST: American Airlines Flight 77 crashes on the west side of the Pentagon.

9:59 AM EST: South Tower (Tower 2) collapses.

10:10 AM EST: A portion of the Pentagon collapses.

10:10 AM EST: Through heroic efforts, United Airlines Flight 93 crashes on a field in Pennsylvania, missing its target, which was believed to be the White House.

10:28 AM EST: North Tower (Tower 1) collapses.