List of original DC-3 operators
The List of original Douglas DC-3 operators lists only the original customers who purchased new aircraft. With the availability of large numbers of surplus military C-47 Skytrains or Dakotas after the Second World War, nearly every airline and military force in the 1940s and 1950s operated the aircraft at some point.
Source: Wikipedia — List of original DC-3 operators (CC BY-SA 4.0)