History of the United States (1991–2008) South Tower less than twenty minutes later at 9:03 A.M. (EST), resulting in the collapse of both 110 story skyscrapers, and the destruction of the World Trade Center. The third hijacked plane, American Airlines Flight 77, was crashed into the Pentagon (the headquarters of the United States Department of Defense) in Arlington County, Virginia, demolishing a section of the outer southwest facing wall. After discovering that their plane, United Airlines Flight 93, was going to be used as a missile, passengers attempted to regain control of the plane which had been redirected towards Washington, D.C. However, after regaining control from
Arlington County, Virginia Arlington helps provide Catholic education in northern Virginia, with early learning centers, elementary and middle schools at the parish level. Bishop Denis J. O'Connell High School is the diocese's Catholic high school within Arlington County. Marymount University is the only university with its main campus located in Arlington. Founded in 1950 by the Religious of the Sacred Heart of Mary as Marymount College of Virginia, both its main campus and its Ballston Center are located on North Glebe Road, with a shuttle service connecting the two. George Mason University operates an Arlington campus in the Virginia Square area between Clarendon