NASA N941NA is the last Super Guppy Turbine Cargo Airplane in service.

NASA N941NA is the last Super Guppy Turbine Cargo Airplane in service.

NASA N941NA is the last Super Guppy Turbine Cargo Airplane in service.

NASA N941NA taxies in front of Hangar 2 at Moffett Field.

NASA N941NA is the last Super Guppy Turbine Cargo Airplane in service.

NASA N941NA is the last Super Guppy Turbine Cargo Airplane in service.

NASA N941NA taxies in front of Hangar 2 at Moffett Field.

NASA N941NA lift off from Ames Research Center at Moffett Field, it is the last Super Guppy still flying.

NASA N941NA Superguppy lands at the Moffett Field. Cargo is loaded into the Super Guppy when the aircraft's "fold-away" nose rotates 110 degrees to the left, allowing unobstructed access to the 25 foot diameter fuselage.

NASA N941NA parked in front of Hangar 1 at Moffett Field. Cargo is loaded into the Super Guppy when the aircraft's "fold-away" nose rotates 110 degrees to the left, allowing unobstructed access to the 25 foot diameter fuselage.

NASA N941NA Superguppy at Moffett Field. Cargo is loaded into the Super Guppy when the aircraft's "fold-away" nose rotates 110 degrees to the left, allowing unobstructed access to the 25 foot diameter fuselage.

Super Guppy Flight Engineer Michael Robinson inside the Cargo Hold. The Super Guppy's cargo hold has a useable volume of 39,000 cubic feet and can fly up to 52,000 pounds as far as 564 miles and has a cruising speed of 290 MPH.

NASA's Super Guppy Turbine cargo aircraft in the hangar at NASA's Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center's Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA's Super Guppy Turbine cargo aircraft in the hangar at NASA's Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center's Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA's Super Guppy Turbine cargo aircraft in the hangar at NASA's Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center's Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA’s Super Guppy Turbine cargo aircraft in the hangar at NASA’s Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center’s Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA’s Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA's Super Guppy Turbine cargo aircraft in the hangar at NASA's Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center's Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA’s Super Guppy Turbine cargo aircraft in the hangar at NASA’s Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center’s Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA’s Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA's Super Guppy Turbine cargo aircraft in the hangar at NASA's Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center's Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA’s Super Guppy Turbine cargo aircraft in the hangar at NASA’s Armstrong Flight Research Center on August 24, 2021. This unique whale-like aircraft arrived at the center’s Building 703 in Palmdale, CA to support crews in the performance of routine maintenance. The Super Guppy aircraft, operated by NASA’s Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way.

NASA's Super Guppy Turbine cargo aircraft in the hangar with SOFIA at NASA's Armstrong Flight Research Center on August 24, 2021. The Super Guppy aircraft, operated by NASA's Johnson Space Center, aids in the transportation of oversized aerospace cargo in a practical and economical way. NASA's Stratospheric Observatory for Infrared Astronomy (SOFIA), maintained and operated by NASA's Armstrong Flight Research Center, is the world's largest airborne astronomical observatory, complementing NASA's space telescopes as well as major Earth-based telescopes.

Members of the flight and ground crews prepare to unload equipment from NASA's B377SGT Super Guppy Turbine cargo aircraft on the ramp at NASA's Dryden Flight Research Center at Edwards Air Force Base, Calif. The outsize cargo plane had delivered the latest version of the X-38 flight test vehicle to NASA Dryden when this photo was taken on June 11, 2000.

NASA's B377SGT Super Guppy Turbine cargo aircraft touches down at Edwards Air Force Base, Calif. on June 11, 2000 to deliver the latest version of the X-38 flight test vehicle to NASA's Dryden Flight Research Center.