The single U.S. Air Force Convair XC-99 (s/n 43-52436) in flight near La Jolla, California, a prototype heavy cargo aircraft, which first flew on 23 November 1947.
USAF
circa 1948 <div style="display: none;">date QS:P,+1948-00-00T00:00:00Z/9,P1480,Q5727902</div>
<a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/photos/index.asp">National Museum of the U.S. Air Force</a> photo <a rel="nofollow" class="external text" href="http://www.nationalmuseum.af.mil/shared/media/photodb/photos/120409-F-XN622-001.jpg">120409-F-XN622-001</a>