To find out who failed and why, the commission has navigated a political landmine, threatening a subpoena to gain access to the president's top-secret daily briefs. Those documents may shed light on one of the most controversial assertions of the Bush administration – that there was never any thought given to the idea that terrorists might fly an airplane into a building.
"I don't think anybody could have predicted that they would try to use an airplane as a missile, a hijacked airplane as a missile," said national security adviser Condoleeza Rice on May 16, 2002.
"How is it possible we have a national security advisor coming out and saying we had no idea they could use planes as weapons when we had FBI records from 1991 stating that this is a possibility," said Kristen Breitweiser, one of four New Jersey widows who lobbied Congress and the president to appoint the commission.
http://www.cbsnews.com/stories/2003/12/17/eveningnews/main589137.shtml