Actually, I really beleive that George Bush was kept out of the loop concerning 9/11: The Perfect Presidential Patsy.
I beleive part of the plan was to have Bush taken out the morning of 9/11 so Cheney could ascend to Presidency, ther by being in Charge just as the Patriot Act was put into Action:

My reason:

In the early morning of 9/11 a group of arab " filmakers showed up where Bush was staying, pressing for an interview that they would tape. Two days before Ahmed Shah Massoud, leader of Afghanistan’s Northern Alliance, had been murdered by a similar ruse.

[link to www.historycommons.org]

On the Morning of 9/11 At about the same time Bush was getting ready for his jog, a van carrying several Middle Eastern men pulled up to the Colony’s guard station. The men said they were a television news crew with a scheduled “poolside” interview with the president. They asked for a certain Secret Service agent by name. The message was relayed to a Secret Service agent inside the resort, who hadn’t heard of the agent mentioned or of plans for an interview. He told the men to contact the president’s public relations office in Washington, DC, and had the van turned away. [Longboat Observer, 9/26/01]
The Secret Service may have foiled an assassination attempt.

Two days earlier, Ahmed Shah Massoud, leader of Afghanistan’s Northern Alliance, had been murdered by a similar ruse. Two North African men, posing as journalists from “Arabic News International,” had been requesting an interview with Massoud since late August. Ahmad Jamsheed, Massoud’s secretary, said that by the night of September 8, “they were so worried and excitable, they were begging us.” An interview was arranged for the following day. As it began, a bomb hidden in the video camera exploded, killing the two journalists. Massoud was rushed by helicopter to a hospital in Tajikistan, but was pronounced dead on arrival (although his death was not acknowledged until September 15).