9/11 hijacker Khalid Almihdhar enters Saudi Arabia on a flight from Sana’a, Yemen. [Bamford, 2008, pp. 64] Almihdhar is on the terrorist watch list there (see 1997), and his passport contains an indicator the Saudi authorities use to track terrorists (see April 6, 1999), so the Saudis presumably register his arrival. Almihdhar likely visits the monitored Yemen hub at this time, since it is in Sana’a and his wife, baby, and other family live at the hub (see (May 26, 2001)).