A timeline of the activities that occurred on September 11, 2001, were compiled by the National Commission on Terrorist Attacks Upon the United States (9-11 Commission). Additionally, several media outlets have assembled timelines of 9-11 based on different news reports and stories of the day's events.

• 8:00 a.m. American Airlines Flight 11 leaves Boston heading for Los Angeles

• 8:14 a.m. United Air Lines Flight 175 leaves Boston heading for Los Angeles

• 8:21 a.m. American Airlines Flight 77 leaves Washington Dulles for Los Angeles

• 8:41 a.m. United Air Lines Flight 93 leaves Newark International for San Francisco

• 8:46 a.m. American Flight 11 crashes into north tower of the World Trade Center

• 9:03 a.m. United Flight 175 crashes into south tower of the World Trade Center

• 9:17 a.m. FAA closes all New York City airports

• 9:31 a.m. President Bush issues statement, "apparent terrorist attack on our country"

• 9:40 a.m. American Flight 77 crashes into the Pentagon

• 9:45 a.m. FAA orders all flights to land, first national air traffic suspension in history

• 9:48 a.m. Evacuations at the U.S. Capitol and the White House's West Wing

• 9:59 a.m South tower of World Trade Center collapses

• 10:07 a.m. United Flight 93 crashes in Shanksville, Pennsylvania

• 10:28 a.m. North tower of World Trade Center collapses

• 5:25 p.m Seven World Trade Center collapses