This undated handout photo provided by the National Air and Space Museum, Smithsonian Institution shows The Milestones of Flight Gallery, the main hall of the Smithsonian’s National Air and Space Museum, in Washington. For the first time since its 1976 opening, the Smithsonian's National Air and Space Museum plans to overhaul its central exhibition showing the milestones of flight. The extensive renovation announced Thursday will be carried out over the next two years with portions of the exhibit closing temporarily over time, said Museum Director J.R. "Jack" Dailey. (AP Photo/Eric Long, National Air and Space Museum, Smithsonian Institution)
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