Summary and Info
The Lockheed R6V Constitution was a large, propeller-driven, double-decker transport aircraft developed in the 1940s by Lockheed as a long-range, high capacity transport and airliner for the U.S. Navy and Pan American Airways. (The Constitutions were identified as R6O until 1950.) Only two of the aircraft were ever built, both prototypes. Although these two planes went into service with the Navy, the Constitution design ultimately proved underpowered and too large for practical airline use at the time. The Constitution remains the largest fixed-wing aircraft type ever operated by the U.S. Navy.