The 9/11 Commission report of July 22, 2004, said, regarding the potential to prevent the attacks of September 11, 2001: “We identified ten ‘operational opportunities’ when we missed a chance to disrupt the 9/11 plot. Among those opportunities were: the failure to share information about the two hijackers [Nawaf al-] Hazmi and [Khalid al-] Midhar, who were known to the CIA and living under their own names in San Diego; the FBI’s failure to link the arrest of [Zacarias] Moussaoui–described as interested in flight training for the purposes of carrying out a terrorist attack–to the increased warning of an attack in the summer of 2001; the failure to detect fraudulent passports or false statements on hijackers’ visas; and the failure to take action in aviation security, such as hardening cockpit doors, in response to warnings of an attack.”
– Thomas Kean and Lee Hamilton, Without Precedent, Page 277