How significant was 9/11?
What happened on 9/11?
7.59am - American Airlines Flight 11 takes off from Boston's Logan International Airport. 92 people are on board.
8.14am - United Airlines Flight 175 takes off from Boston's Logan International Airport. 65 people are on board.
8.19am - A flight attendant on Flight 11 radio's American Airlines saying that she thinks the plane is being hijacked.
8.20am - American Airlines Flight 77 takes off from Washington Dulles International Airport. 64 people are on board.
8.40am - NORAD is informed that Flight 11 has been hijacked.
8.42am - United Airlines Flight 93 takes off from Newark International Airport. 40 people are on board.
8.42am (aprox) - Flight 175 is hijacked.
8.44am - Flight attendant Amy Sweeny aboard Flight 11 telephones American Airlines to report that the plane is flying too low.
8.46am - Two F-15 Fighter Planes are launched to intercept Flight 11.
8.46am - Flight 11 crashes into the North Tower of the World Trade Centre.
CNN's first reporting of the World Trade Centre being hit by an aeroplane.
8.49am - CNN interrupt broadcasting to break news of the disaster. See above.
8.50am (aprox) - Flight 77 is hijacked.
8.52am - Telephone calls are made from Flight 175 reporting that it has been hijacked.
NBC's live coverage of the second tower being hit by an aeroplane.
9.03am - Flight 175 crashes into the southern side of South Tower. The impact is seen on live television: see above.
9.28am - Flight 93 is hijacked. Air traffic controllers hear the hijacking happening.
Coverage of the attack on the Pentagon
9.37am - Flight 77 smashes into the side of the Pentagon Building.
9.57am - A Passenger revolt begins on Flight 93.
First Tower Collapses
9.59am - The First Tower Collapses. See above.
10.03am - Flight 93 crashes after a fight between the hijackers and passengers in the cockpit.
Second Tower Collapses
10.28am - The South Tower begins to collapse. See above.