The Boeing Model 299 in flight in 1935.
USAAC
1935
USAF museum website, USAF photo no. 060706-F-1234S-001 <a rel="nofollow" class="external autonumber" href="http://www.nationalmuseum.af.mil/shared/media/photodb/photos/060706-F-1234S-001.jpg">[1]</a>, retrieved 2009-04-02