10/31/2007. Remarks by Johan Visschedijk: "The USAAF ordered two XP-90 prototypes on June 20, 1946, s/n 46-687 and 46-688. The first flight was made by Tony LeVier on June 3, 1949, by that time the type was redesignated XF-90. Due to engine problems this Lockheed design lost out in June 1950 to the McDonnell XF-88 in the competition for a penetration fighter, and in September the development was terminated. 46-687 was tested to destruction in the NACA laboratory in Cleveland, Ohio."