A lot of the comments from the usual suspects on the 9/11 attacks run along the lines that no one ever imagined terrorists would be capable of, much less want to, simultaneously hijacks several jets and crash them into American targets. In fact, CNN reports that the FBI was warned several years ago that terrorist Ramzi Yousef had planned just such an act,
In another development, the FBI was warned six years ago of a terrorist plot to hijack commercial planes and slam them into the Pentagon, the CIA headquarters and other buildings, Philippine investigators said.
Philippine authorities learned of the plot after a small fire in a Manila apartment, which turned out to be the hideout of Ramzi Yousef, who was later convicted for his role in the 1993 bombing of the World Trade Center. Yousef escaped at the time, but agents caught his right-hand man, Abdul Hakim Murad, who told them about plots to hijack U.S. jets.