New York Magazine

The Secret History of 9/11 -- New York Magazine: "Marvin Bush, the president’s younger brother, was a director of Securacom, a firm that on 9/11 was in charge of security not only at the World Trade Center but also for United and American airlines as well as at Dulles airport, where Flight 77 took off."

“Bush’s cousin, Wirt Walker III, worked there, too.”