L-1049 Constellation Trans World AirlinesLockheed L 1049 Constellation TWA model. Design of the Lockheed L 49 began in 1939 to meet the requirement of Pan American Airways and Transcontinental &, Western Air (now Trans World Airlines), for a 40 passenger airliner for use on domestic routes. Manufacture of the airplane was initiated, but with the outbreak of World War II aircraft on the production line were commandeered for service with the USAAF as transports under the designation C 69, the