Lockheed Constellation
The prototype Lockheed Constellation took to the skies for the first time on January 9, 1943. Initially, the war effort led to examples only being produced for military service. When peace came Constellations began to be operated by airlines and its popularity among carriers led to the Super Constellation and ultimately the Starliner. The Constellation served widely with numerous designations in the US military though was only operated by a small number of other air arms.