C-121 ColumbineLockheed C 121 airplane model. Columbine III served as the Presidential aircraft until President Eisenhower left office in January 1961. It remained in service transporting government officials and visiting foreign dignitaries throughout the world until it was retired. The Lockheed Constellation, affectionately called Connie, was a four engine propeller driven airliner that has been used both in civilian and military service. Military versions were