" Mustafa Alhawsawi, a brother of one hijacker, sent them $18,000 via Western Union. He also received by return transfer all the group’s leftover funds—about $42,000—when the hijackers wound up their affairs in late August 2001 and prepared to die. "

― Steve Coll , Ghost Wars: The Secret History of the CIA, Afghanistan, and Bin Laden from the Soviet Invasion to September 10, 2001