From the History Commons Groups blog:

A large number of entries have been added to the Complete 9/11 Timeline at History Commons, most off which provide new details about the events of the day of September 11, 2001.

One new timeline entry describes a training exercise based on the scenario of a possible terrorist attack that was run on the morning of September 11 by the US Coast Guard in Tampa Bay, Florida, quite close to Sarasota, where the president was at the time. Another entry deals with a meeting scheduled to take place at the Pentagon that morning, regarding a planned "disaster exercise" at the nearby Navy Annex building.

An entry reveals that a number of FBI agents had, for reasons that are unknown, already arrived at the Navy Annex when the Pentagon was hit. Later on, the Navy set up a new command center at the Navy Annex, after its original command center was destroyed in the Pentagon attack.

Several entries describe the futile attempts of intelligence officers at NORAD's Northeast Air Defense Sector (NEADS) to obtain information about the first hijacking. After learning of the hijacking, a NEADS intelligence officer called the FBI's Strategic Information and Operations Center and the National Military Joint Intelligence Center at the Pentagon, but neither of them could provide any information. Searches on the SIPRNET--the US military Internet system--also revealed nothing. Furthermore, the threat briefing at NEADS that morning had included no indication of an increase in the terrorist threat level.

Some NEADS personnel have said they were monitoring Flight 93 long before the time at which the 9/11 Commission concluded the military was first alerted to this hijacked aircraft. Also, a commander at NEADS complained that an officer from the NEADS battle cab had come down to the operations floor, where he had been "circumventing my system." What is more, NEADS personnel only learned that the president's plane, Air Force One, was airborne about half an hour after it took off from Sarasota.

New entries describe in detail the actions of Laura Bush, the first lady, on September 11. Laura Bush learned of the first crash in New York as she was about to leave the White House and go to Capitol Hill, to attend a hearing there. When her limousine drove off from the White House, she was unaware that a second plane had hit the World Trade Center minutes earlier. She only learned of this second crash just before she reached Capitol Hill.

When she arrived on Capitol Hill, Laura Bush initially spent time with Senator Edward Kennedy in his office. However, her arrival apparently did not lead to any increase in the level of security. She was even allowed to make an appearance before the press, which was shown live on television. But a reporter who attended the appearance was subsequently warned to stay away from the windows of the building, because it was thought that a suspicious aircraft was heading in their direction.

Following the public appearance, Laura Bush and her staff headed to the office of Senator Judd Gregg, on a lower floor of the building. After they waited there for a short time, the Secret Service emergency response team arrived and escorted them out of the building. Laura Bush and her entourage were then driven to the Secret Service headquarters, but they were significantly slowed by the heavy traffic and reportedly arrived about 45 minutes after leaving Capitol Hill.

At the Secret Service headquarters, Laura Bush spoke over the phone with her daughters and her mother. During the afternoon, her Secret Service agents told her to be prepared to leave Washington for several days. Later on, some of her staffers briefly returned to the White House before heading home. Then, after it was learned that the president would be returning to Washington that day, it was decided that the first lady could go back to the White House and so she was driven there early in the evening. When the president subsequently arrived at the White House, he was reunited with his wife there.

Several timeline entries deal with the movements of Air Force One after it left Sarasota with the president on board. The director of the White House Military Office received a call from the White House Situation Room advising him not to bring the president back to Washington, DC. The pilot of Air Force One and some of the president's staffers then agreed that they should head to somewhere other than Washington. Shortly after taking off, the plane therefore changed course and flew west. At around 10:20 a.m., Barksdale Air Force Base in Louisiana was identified as a suitable destination for the plane, although a few accounts have claimed that Air Force One headed toward Barksdale about 25 minutes later.

At 10:37 a.m., President Bush was notified that his wife and daughters had been taken to safe locations, although Bush's daughters reportedly only reached "secure locations" just before 11:00 a.m. At 10:41 a.m., Vice President Dick Cheney called the president and advised him against returning to Washington. Then, as Air Force One approached Barksdale, the president talked over the phone with his wife for the first time that morning.

A few new entries describe events before 9/11, and cover various training exercises. These include a Federal Aviation Administration exercise that was based around a simulated plane hijacking and an FBI exercise, also based around a hijacking, held at Washington Dulles International Airport--the airport from which one of the hijacked planes took off on September 11. Another entry describes the arrival of Federal Emergency Management Agency (FEMA) representatives in New York the day before 9/11, ready for a training exercise called "Tripod" that was set to take place on September 12. However, the first FEMA urban search and rescue teams to reach New York following the terrorist attacks only arrived at around 10:30 p.m. on September 11.

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