|1943||First flight as NX25600 on 9 January|
|1943||Handed over as 43-10309 C-69 to USAF|
|1944||Converted to P&W R-2800 XC-69E|
|1945||Converted back to R-3350|
|1946||Sold as NC67900 to Howard Hughes NC67900|
|1950||Sold to Lockheed (TT: 404 hrs)|
|1950||Converted to Super Constellation|
First prototype Constellation. Construction started June 1941 and completed November 1942. Here seen during engine tests of the Wright R-3350 Duplex Cyclones at the Lockheed plant at Burbank in November 1942.