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At 8:46 a.m., American Airlines Flight 11 crashed with a speed of about 490 mph into the north side of the north tower of the World Trade Center between floors 94 and 98.
At 9:02 a.m., United Airlines Flight 175 crashed with a speed of about 590 mph into the south side of the south tower between floors 78 and 84.
At 9:37 a.m., American Airlines Flight 77 crashed into the west side of the Pentagon. The crash killed all 59 people on board and 125 Pentagon personnel.
At 10:03 a.m., United Airlines Flight 93 crashed in a field southeast of Pittsburgh in Somerset County, Pa., killing everyone on board.
The Pentagon community is bound by a solemn mission to defend and carry forward the values of the nation and sometimes make sacrifices, Defense Secretary Ash Carter said during a 9/11 remembrance ceremony. Story
The family members who return yearly to the Pentagon to mark the anniversary of 9/11 exemplify strength and resilience, Defense Secretary Ash Carter said during a morning remembrance ceremony. Story
Vice Chairman Honors 9/11 Victims
Defense Leaders Hose 9/11 Remembrance Ceremonies