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, Kentucky on the name "Arlington" after Arlington Heights, Virginia, the hometown of a railroad official. The new city was incorporated in 1876. When Carlisle County was created in 1886, Arlington was initially selected as the seat of the new county. The nearby city of Bardwell challenged this, however, noting its more central location within the county. County officials agreed, and moved the seat to Bardwell shortly afterward. Arlington is located in southern Carlisle County at . U.S. Route 51 and Kentucky Route 80 intersect in the city. US 51 leads north to Bardwell, Kentucky, and to Cairo, Illinois, while leading south