• 8:46 a.m.: Flight 11 crashes into the North Tower of the World Trade Center (WTC).
• 8:50 a.m.: White House Chief of Staff Andrew Card tells President George W. Bush, who's visiting a Florida elementary school, about the crash.
• 8:55 a.m.: Occupants of the unhit WTC's South Tower are told not to evacuate. The building is secure. Then, minutes later, the New York Port Authority initiates an evacuation.
• 9:03 a.m.: Flight 175 smashes into the South Tower.
• 9:31 a.m.: Bush, speaking in Florida, says the country has suffered an "apparent terrorist attack."
• 9:37 a.m.: Hijackers crash Flight 77 into the Pentagon.
• 9:42 a.m.: The FAA, for the first time in history, halts all flights in the US and orders those in the air to land.
• 9:48 a.m.: US authorities evacuate the US Capitol and the White House's West Wing.
• 9:59 a.m.: The South Tower collapses.
• 10:03 a.m.: Hijackers, trying to prevent passengers from retaking the plane, crash Flight 93 in a field southeast of Pittsburgh.
• 10:28 a.m.: The North Tower collapses.
• 10:50 a.m.: New York postpones primary elections.
