The Aero Spacelines B377SGT Super Guppy was at Dryden in May, 1976, to ferry the X-24 and HL-10 lifting bodies from the Center to the Air Force Museum at Wright-Patterson Air Force Base, Ohio. The oversized cargo aircraft is a further modification of the B377PG Pregnant Guppy, which was built to transport outsized cargo for NASA's Apollo program, primarily to carry portions of the Saturn V rockets from the manufacturer to Cape Canaveral. The original Guppy modification incorporated the wings, engines, lower fuselage and tail from a Boeing 377 Stratocruiser with a huge upper fuselage more than 20 feet in diameter. The Super Guppy further expanded the fuselage, replaced the original piston engines with more powerful turbo-prop engines, and added a taller vertical tail for better lateral stability. The Super Guppy and the Super Guppy Turbine are still in occasional use by NASA and Airbus Industries, Inc., to transport oversize structures.