The Lockheed Constellation was used by dozens of airlines and militaries around the world. In military service, the Navy/Air Force EC-121 Warning Star variant remained operational until 1978, nearly 40 years after work on the L-049 began.
♠ Original operators
Commercial
Lockheed built 856 planes. Civilian airlines that operated the Constellation included:
- Aerolíneas Carreras
- Aerotransportes Entre Ríos - AER
- Trans Atlántica Argentina
- Transcontinental ♠
- Qantas ♠
- Aero Transport
- Nordair ♠
- Trans Canada Airlines ♠ (Now Air Canada)
- Transportes Aéreos Squella
- Aerolineas Mundo S.A.-AMSA
- Aerotours Dominicana
- Aerovías Quisqueyana
- Air France ♠
- CATAIR - Compagnie d'Affretements et de Transports Aeriens
- El Al ♠
- KLM ♠
- AFISA - Aero Fletes Internacionales SA
- Líneas Aéreas de Panama
- LANSA
- Perú Internacional - COPISA
- Trans-Peruana
- Government of Senegal
- Iberia ♠
- ACE Freighters
- British Overseas Airways Corporation
- Britannia Airways
- Euravia
- Falcon Airways
- Trans European Aviation
- Skyways of London
- Universal Sky Tours
- Alaska Airlines
- American Airlines
- American Overseas Airlines ♠ (7 x L-049)
- Braniff International Airways
- California Central Airlines
- Capital Airlines
- Central American Airlines
- Chicago and Southern Air Lines ♠
- Delta Air Lines
- Eastern Air Lines ♠
- Federal Aviation Administration
- Flying Tiger Line ♠
- Great Lakes Airlines
- Imperial Airlines
- Intercontinent Airways
- Miami Airlines
- Modern Air Transport
- NASA
- National Airlines ♠ (4 x L-1049H)
- Northwest Orient Airlines
- Pacific Air Transport
- Pacific Northern Airlines
- Pan American World Airways ♠
- Paradise Airlines (intrastate carrier in California)
- Regina Cargo Airlines
- Resort Airlines ♠
- Seaboard & Western Airlines ♠ ( 4 x L-1049D, 5 x L-1049H)
- Seaboard World Airlines
- Slick Airways ♠
- South Pacific Air Lines [1]
- Trans World Airlines ♠ (launch operator)
- United States Airways
- Western Airlines
- Wien Air Alaska
