US Navy F9F Panther Prototypes
Two Grumman F9F Panther prototypes in flight in 1948. The aircraft closer to the camera is the XF9F-3 (BuNo 122476), having an Allison J33-A-8 engine, the further plane is a XF9F-2, powered by a Pratt & Whitney J42-P-6 engine (a licence-built Rolls-Royce Nene).