Original plans for the 9/11 attacks called for bin al-Shibh to be one of the hijacker pilots, along with three other members of the Hamburg cell, including Mohamed Atta, Marwan al-Shehhi, and Ziad Jarrah [REF].
According to the 9/11 Commission, this refusal of a visa was motivated by general concern by U.S. officials at the time that people from Yemen, which was struggling economically, would illegally overstay their visit and seek work in the United States.