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U.S. intelligence agencies were fully aware that the hijackers were in the United States and even helped at least two of them get there.

The idea of Al-Qaeda hijacking an airplane and flying it into a building was entirely plausible before 9-11, and officials knew it could happen.

Israeli intelligence officials claimed they warned the United States about large-scale terror attacks on highly visible targets, but the specifics of those warnings have never been made public.

In May 2001, an intelligence report concluded that the FAA issued a circular to airlines warning of a heightened increase in hijackings.

On August 6, 2001, President Bush received a presidential daily briefing titled 'Bin Laden Determined to Strike in U.S.' which indicated that Al-Qaeda members had resided in or traveled to the U.S. for years.

On July 10th, 2001, CIA Director George Tenet and his counterterrorism deputy, Jay Kofer Black, were alarmed by intelligence pointing to an impending attack by Al-Qaeda.

The CIA knew the hijackers were in the United States and planning an act of terror before 9-11.