A group of German enthusiast investors, DIAG Aviation GmbH, has put a Lockheed Constellation C-121C Constellation up for sale, giving up on a three-year project to restore the aircraft after acquiring it from Super Constellation Flyers Association.

HB-RSC (msn 4175) remains registered as an antique aircraft in the Swiss register and is formally owned by a local investment broker, Immo Norse AG. The 1955 vintage quad-engine aircraft was last flown in 2016 and subsequently "professionally disassembled" following the sale by its previous Swiss owners. DIAG Aviation had hoped to rebuild and reactivate the aircraft but never did so.

It is now stored at Bremgarten and can be transported globally to a new owner. The aircraft was configured for up to 36 passengers.

The aircraft was the penultimate flying C-212C in the world. Following its disassembly, the last active unit of the type is VH-EAG (msn 4176), operated by the Historical Aircraft Restoration Society in Australia.