Scandinavian Airlines (SAS), previously known as Scandinavian Airlines System, is the national airline of Denmark, Norway and Sweden. Headquartered in Sigtuna outside , Sweden, it operates out of three main hubs, Copenhagen Airport, and Oslo Airport, Gardermoen. Owned by the eponymous SAS Group, the airline transported 22.9 million passengers to 90 destinations on an average 683 flights daily in 2011. As of July 2017, SAS utilize 160 aircraft—jetliners and turboprops—consisting of 76 Boeing 737, 23 Bombardier CRJ900 operated by Cimber and Cityjet, 34 Airbus A319/A320/A321, 16 Airbus A330/A340 and 11 ATR 72's operated by Jettime and FlyBe.
The airline has operated over 700 aircraft throughout its history. It was a loyal customer of Douglas Aircraft Company and its successor McDonnell Douglas, operating 290 aircraft and all major models from the DC-3 through the MD-90, except the MD-11. Boeing is the second-largest manufacturer with 127 aircraft, of which 105 were 737s. Other manufacturers have been Fokker (51 aircraft), Bombardier (40), Airbus (29), Convair (22), Sud Aviation (21), Saab (14), Vickers (9), ATR (6), British Aerospace (3), British Aircraft Corporation (2), Junkers (2) and Shorts (2). SAS has been the launch customer of the Saab Scandia, the Sud Aviation Caravelle, the McDonnell Douglas DC-9-20 and −40 and the Boeing 737–600. SAS was the sole customer of the DC-9-20; the DC-9-40 served SAS for 34 years—longer than any other model. Fourteen aircraft have been involved in hull-loss accidents, four of which were fatal.