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He is an al-Qaida operative with strong ties to senior al-Qaida leadership, including Osama Bin Laden. He trained at terrorist camps in Afghanistan and tried to enter the U.S. in August 2001. His attempt to enter the U.S. from the Middle East on a one-way airline ticket and $2,800 in cash was foiled by immigration officials at the Orlando International Airport. Instead of meeting Mohamed Atta, the lead September 11th hijacker who was waiting for him at the airport, Kahtani returned to the Middle East. Had Kahtani succeeded in entering the U.S., it is believed he would have been on United Airlines Flight 93, the only hijacked aircraft that had four hijackers instead of five.