The Super Guppy is shown at the Redstone Airstrip. NASA used the aircraft to transport the S-IVB upper stage used on the Saturn IB and Saturn V launch vehicles between manufacturing facilities on the West coast, and testing and launch facilities in the Southeast. This aircraft was built by John M. Conroy of Aero Spaceliners, Incorporated, who started with the fuselages of a surplus Boeing C-97 Stratocruiser, ballooned out the upper decks enormously, and hinged the front sections so that they could be folded back 110 degrees. The Super Guppy flew smoothly at a 250-mph cruising speed, and its cargo deck provided a 25-foot clear diameter.