(Editor's Note: This is a timeline of a few of the major events from Tuesday, September 11, 2001. All times are Eastern Daylight Time. The data are taken from a variety of sources.)
8:45 a.m. - The first airliner crashes into New York's World Trade Center, striking the North Tower. It is later identified as American Airlines Flight 11, carrying 81 passengers and 11 crewmembers, and departed Boston for Los Angeles.
9:03 a.m. - A second airliner is crashed into the World Trade Center, striking the South Tower. It is identified as United Airlines Flight 175 and carried 56 passengers and nine crewmembers. It too was headed for Los Angeles from Boston.
9:17 a.m. - Five airports in the New York City region are closed by the Federal Aviation Administration.
9:30 a.m. - President Bush briefly speaks from Florida, saying the United States had sustained an "apparent terrorist attack."
9:39 a.m. - A third aircraft, American Airlines Flight 77, is crashed into the Pentagon. Fifty-eight passengers, four flight attendants and two pilots were onboard the flight, which had departed Dulles International Airport near Washington, D.C.
9:40 a.m. - The FAA orders all American airline traffic grounded.
9:45 a.m. - White House evacuated.
9:57 a.m. - Bush departs Florida.
10:05 a.m. - The South Tower of the World Trade Center collapses.
10:10 a.m. - A fourth airliner, United Airlines Flight 93, crashes in Pennsylvania with 38 passengers, five flight attendants and two pilots onboard. The flight is thought to have been bound for another target in Washington, D.C.
10:28 a.m. - The North Tower of the World Trade Center collapses.
10:45 a.m. - All federal office buildings in Washington, D.C. are evacuated.
11:02 a.m. - Orders are given to evacuate areas around the World Trade Center.
1:04 p.m. - President Bush says the American military has been put on global alert, and made his remarks from Barksdale Air Force Base in Louisiana, where Air Force One stopped to re-fuel.
1:48 p.m. - President Bush departs Barksdale AFB for Offutt Air Force Base in Nebraska.
Shortly before 3:00 p.m. - Air Force One lands at Offutt AFB in Omaha, Neb.
6:54 p.m. - Bush returns to the White House from Omaha.
8:30 p.m. - President Bush speaks to the nation from the Oval Office in the White House.