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
Construction of the Virginia approaches to Arlington Memorial Bridge steel, timber, and other building materials as well as construction personnel were being diverted to war needs, federal officials believed it would be 12 to 18 months before the bridge could be rebuilt. In fact, the bridge was not replaced until 1949. Steel for the new Lee Boulevard connecting bridge was obtained only in December 1948. Reconstruction of the bridge occurred in spring 1949. In 1951, the name of Lee Boulevard was changed to Arlington Boulevard to end confusion with Lee Highway. Construction of the Virginia approaches to Arlington Memorial Bridge The construction of the Virginia approaches to Arlington Memorial