Just one year and two days after making their first flight at Dutch Flats in San Diego, California, on April 28, 1927, Lindbergh and the Spirit of St. Louis flew together for the final time while making a hop from St. Louis to Bolling Field, in Washington, D.C., on April 30, 1928. There he presented his monoplane to the Smithsonian Institution where for more than eight decades it has been on display, hanging for 48 years (1928–76) in the Arts and Industries Building and today hanging, since 1976, in the atrium of the National Air and Space Museum alongside the Bell X-1 and SpaceShipOne. At the time of its retirement, the Spirit had made 174 flights, totaling 489:28 hours in the air.[16]