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Around 25 minutes after controllers lost contact, Flight 11 crashes into the north tower of the World Trade Center.
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Air traffic controllers believe American Airline Flight 11 has been hijacked.
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Another plane, flight 77, is unable to reach contact with air traffic controllers.
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Flight 175 crashes into the World Trade Center's south tower 43 minutes after air traffic control lost contact with the flight's pilots.
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Air traffic control finds out that Flight 93 has been hijacked.
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Flight 77 crashes into the Pentagon between carridors 4 and 5.
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The World Trade Center's south tower falls.
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Flight 93's unsuccessful mission to attack the nation's Capital ended in a crash in Pennsylvania.
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The north tower of the World Trade Center disintegrates.
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Building 7 of the World Trade Center is demolished.