8:46 a.m.: American Airlines Flight 11 crashes into the North World Trade Center tower. Flight 11 departed Boston bound for Los Angeles at 7:59 a.m., carrying 92 people including 5 hijackers.
9:03 a.m.: United Airlines Flight 175 crashes into the South World Trade Center tower. Flight 175 departed Boston bound for Los Angeles carrying 65 people including 5 hijackers.
9:05 a.m.: President George W. Bush, speaking to students at the Emma E. Booker Elementary School in Sarasota, Fla., is interrupted by Chief of Staff Andrew Card about a second plane crashing into the South Tower.
9:13 a.m.: Two F-15 fighter jets from Otis Air National Guard Base leave military airspace on Cape Cod and head for Manhattan. Minutes later, the Federal Aviation Administration bans takeoffs nationwide for flights heading to the New York area.
9:21 a.m.: All bridges and tunnels into Manhattan are closed. Residents and workers in lower Manhattan take to the streets to get away from the ash filling the air.
9:40 a.m.: American Airlines Flight 77 crashes into the west side of the Pentagon, killing all 64 people on board and 125 Pentagon personnel.
9:43 a.m.: The West Wing of the White House and the U.S. Capitol building are evacuated and closed.
9:59 a.m.: The South Tower of the World Trade Center collapses.
10:03 a.m.: United Airlines Flight 93 crashes near Shanksville, Pa., following a passenger revolt against the hijackers. All 44 people on board, including 4 hijackers, were killed.
10:28 a.m.: The North Tower collapses approximately 30 minutes after the South Tower.
10:49AM: New York City Mayor Rudy Giuliani orders an evacuation of Lower Manhattan.
5:00 p.m.: As rescue workers continue to go through the rubble, New York City firemen hoist an American flag at the site of the World Trade Center -- an iconic image often compared to the World War II photo of the raising of the flag on Iwo Jima.
8:30 p.m.: President Bush addresses the nation from the White House. Members of Congress are told that the administration has enough evidence indicating Usama bin Laden and his Al Qaeda terrorist network are responsible for the attacks.
On September 11, 2001, Al Qaeda launched a series of coordinated and deadly terror attacks on American soil that struck the heart of the country's military and financial power centers. Click through for a timeline of the events that occurred on that day.