9/11 hijacker Khalid Almihdhar departs Saudi Arabia, flying to the US. [9/11 Commission, 7/24/2004, pp. 237] According to the 9/11 Commission, Almihdhar has a passport containing an indicator of Islamic extremism (see June 1, 2001). Such indicators are used by the Saudi authorities to track some of the hijackers before 9/11 (see November 2, 2007), so the Saudis presumably register his departure.