With 92 passengers aboard, American Airlines Flight 11 takes off from Logan International Airport in Boston en route to Los Angeles.
United Airlines Flight 175, with 65 passengers aboard, takes off from Boston to Los Angeles.
Flight attendants aboard American Airlines Flight 11 send an alert to ground personnel warning their plane had been hijacked. American Airlines personnel then notifies the FBI.
American Airlines Flight 77 takes off with 64 passengers aboard heading to Los Angeles from Dulles International Airport outside of Washington, D.C.
In an alleged attempt to communicate with the plane’s cabin, hijacker Mohammed Atta of the militant Islamist group al-Qaida makes the first of two accidental transmissions from Flight 11 to ground control.
Air traffic controllers of the Federal Aviation Administration (FAA) alert the Northeast Air Defense Sector (NEADS) of the North American Aerospace Defense Command about the suspected hijacking of Flight 11. NEADS personnel send two fighter planes in response to locate and tail the hijacked plane.
United Airlines Flight 93 takes off from Newark International Airport to San Francisco with 44 passengers aboard.
Atta and the other hijackers aboard American Airlines Flight 11 crash into floors 93-99 of the north tower of the World Trade Center in New York City.
New York City Police Department and Fire Department forces dispatch units to the World Trade Center within seconds of the crash of Flight 11. Port Authority Police Department officers on the scene begin immediate evacuation of the north tower.
Former White House Chief of Staff Andrew Card alerts then-President George W. Bush about the plane crashing into the World Trade Center. At the time, Bush was visiting an elementary school in Sarasota, Florida.
Port Authority officials broadcast orders to evacuate both towers. An estimated 10,000 to 14,000 people were already in the process of evacuation.
Hijackers aboard Flight 175 crash the airplane into floors 75-100 of the south tower of the World Trade Center.
FAA personnel notify NEADS of the suspected hijacking of Flight 77 after some passengers and crew members aboard the aircraft were able to contact their family and friends on the ground.
Speaking from Sarasota, Florida, Bush calls the events in New York City an “apparent terrorist attack on our country.”
Flight 77 crashes into the west side of the Pentagon in Washington, D.C.
For the first time in the administration’s history, the FAA grounds all flights over or bound for the continental United States. At airports in Canada and the U.S., 3,300 commercial flights and 1,200 private planes were guided to land.
The White House and the U.S. Capitol building, along with other high-profile buildings, landmarks and public spaces, evacuate amid rumors of other attacks.
The south tower of the World Trade Center collapses.
When passengers and crew members aboard Flight 93 contact family and friends to tell them about the attacks in New York and Washington, D.C., they attempt to retake the plane from hijackers. In response to this attempt, the hijackers purposefully crash the plane into a field in Somerset County, Pennsylvania.
The north tower of the World Trade Center collapses, 102 minutes after Flight 11 crashed into the building.
Former New York Mayor Rudolph Giuliani calls for an evacuation of Lower Manhattan south of Canal Street. Nearly 1 million residents, workers and tourists evacuate as the search for survivors at the World Trade Center continues throughout the afternoon.
From Barksdale Air Force Base in Louisiana, Bush announces that U.S. military forces are on high alert worldwide.
U.S. Navy dispatches missile destroyers to New York and Washington, D.C.
The 47-story World Trade Center collapses after hours of burning. Because the building was evacuated in the morning, there were no casualties, but the collapses forced workers to flee from the area.
Bush returns to the White House after stopping at military bases in Louisiana and Nebraska.
President Bush addresses the nation, stating the attacks were “evil, despicable acts of terror.” Bush then declares America, its friends and allies would “stand together to win the war against terrorism.”