9/11: Timeline of events covering a fateful day

As Americans honor and commemorate the lives lost on 9/11, we recall the timeline of how the infamous day unfolded 20 years ago:

8:46 a.m.: Five hijackers crash American Airlines Flight 11 into the North Tower of the World Trade Center. The plane had departed from Logan International Airport at 7:59 a.m.

9:03 a.m.: Five hijackers crash United Airlines Flight 175 into the South Tower of the World Trade Center. The plane had departed from Logan Airport at 8:15 a.m.

9:05 a.m.: President George W. Bush is informed of the second plane crash. He delivers remarks to the nation 25 minutes later.

9:37 a.m.: Five hijackers crash American Airlines Flight 77 into the Pentagon. The plane had departed from Washington Dulles International Airport at 8:20 a.m.

9:42 a.m.: The Federal Aviation Administration grounds all civilian planes in U.S. airspace and prohibits departures.

9:59 a.m.: The South Tower of the World Trade Center collapses in a mere 10 seconds.

10:03 a.m.: Four hijackers crash United Airlines Flight 93 in a field near Shanksville, Pa. The plane had departed Newark International Airport at 8:42 a.m.

10:28 a.m.: The North Tower of the World Trade Center collapses after burning for 102 minutes.

COurTEsy HAlIFAX INTErNATIONAl AIrPOrT AuTHOrITy DRASTIC ACTION: Grounded jetliners — mainly inbound trans-Atlantic flights — fill a runway at Halifax Stanfield International Airport in Nova Scotia after the United States closed its airspace.

AP FIlE ‘WE’RE AT WAR’: Chief of staff Andrew Card informs President George W. Bush of the attacks.