Enola Gay is the Martin-built B-29-45-MO airframe with military serial 44-86292, preserved by the National Air and Space Museum as accession A19500100000. It flew the Hiroshima mission on August 6, 1945, and later served in the Operation Crossroads test programme. Transferred to the Smithsonian in 1949, the aircraft made its final flight in December 1953. Following extensive restoration, it is displayed at the museum’s Steven F. Udvar-Hazy Center.