From the History Commons Groups blog:

A large number of new entries have been added to the Complete 9/11 Timeline at History Commons, including many that reveal details about the events of September 11, 2001, and others that describe important events from the years preceding the 9/11 attacks.

Security Chief Predicted Attacks on the WTC

Several entries relate to the actions of Rick Rescorla, Morgan Stanley Dean Witter's vice president for security at the World Trade Center, and his friend and former Army colleague Dan Hill. In 1990, the two men wrote a report that predicted a terrorist attack at the WTC closely resembling the 1993 bombing, involving a truck bomb in the underground garage. In the aftermath of the 1993 WTC bombing, Hill and Rescorla conducted an analysis of security and predicted that terrorists would attack the towers again, probably by crashing a plane into them. Rescorla consulted his friend Fred McBee, who, by using a flight simulator program on his computer, concluded that such a scenario was "very viable."

In 1998, Hill came up with a plan to go to Afghanistan and kill Osama bin Laden. In spring 2000, he met with an FBI agent to discuss the plan and request US military assistance. But a year later, after she consulted FBI headquarters, the agent informed Hill that his request had been rejected and so he had to drop his plan.

Some entries relate to training exercises held at the World Trade Center. In one drill, conducted in 1982, the Port Authority and other agencies actually practiced for the scenario of a plane crashing into the Twin Towers. In March 1993, during public hearings that examined the security aspects of the recent WTC bombing, Guy Tozzoli, a former director of the World Trade Department, said the Port Authority should again train for the possibility of a plane hitting the WTC, but his recommendation was ignored. However, in June 1999, September 2000, and summer 2001, the Port Authority and the New York City Fire Department held realistic exercises that simulated a major fire on an upper floor of the WTC.