SpaceShipOne, the first privately built and piloted vehicle to reach space, hangs between Charles Lindbergh's Spirit of St. Louis, left, and Chuck Yeager's Bell X-1, above right, in the Milestones of Flight in the National Air and Space Museum's building on the National Mall in Washington, D.C. Credit: Photo by Eric Long/OIPP, National Air and Space Museum, Smithsonian Institution. Click to enlarge.
