The C-97 military transport was, in its 1944 prototype, essentially a large upper fuselage tube attached to a B-29 lower fuselage and wings, with an inverted figure-eight cross-section. In its production version it incorporated the key elements of the B-50 platform including, after the first 10 in production, the enlarged tailfin of the B-50. The B-29 and B-50 were phased out with introduction of the jet-powered B-47 Stratojet. The B-50 was nicknamed "Andy Gump", because the redesigned engine nacelles reminded aircrew of the chinless newspaper comic character popular at the time.