Can you spot what is different about this Boeing 747SP (C-GTFF)? If you guessed the engine attached to the upper deck -- you win. Pratt & Whitney is testing the PW1200G engine. Photo by Guy Norris.

Guy Norris, with Aviation Week, recently posted an interesting story and photos on Pratt & Whitney’s flying test bed – a class Boeing 747SP. P&W is in the process of testing  their PW1200G engine, that is slated to for the Mitsubishi Regional Jet (MRJ) and Norris was able to take a tour of the unique and classic aircraft.

P&W uses a Boeing 747SP that was originally delivered to Korean Airlines (reg HL7457) on January 30, 1980. It flew with the airline until it was placed into storage in 1998. Then in 2008, P&W purchased the 747SP to use for engine testing.

Big kudos to P&W for keeping a few rows of first class seats and the mural. For those who dream of the “golden age” of flying, those are the seats you used to fly in. Compare them to some of of the products available today: Emirates Airlines or Singapore Airlines first class product and really, how can you miss the “golden age” that much?

To see more photos and learn more about the testing check out Norris’ story on Aviation Week. Also check out additional photos of the 747SP on Airliners.net.