In the wake of the success of his Pregnant Guppy, constructor Jack Conroy discussed his concepts for other outsize transports with "Air Progress" in their publication, "World's Greatest Aircraft" (Petersen Publications, 1973). Conroy considered the creation of an outsize transport from the Princess to have been basically feasible, in that it shares a sectional 'double-bubble' fuselage construction similar to that of the Boeing Model 377 Stratocruiser, on which the Guppies were based. The reason for considering producing such an aircraft was the desire of NASA to possess a means of transporting first stage of the Saturn V rocket by air, if this were possible, to Cape Canaveral; the ability for the aircraft to conduct a water landing would also be advantageous for proximity landing at sea, or on nearby lakes in Florida.