Scandinavian Airlines (SAS), previously known as Scandinavian Airlines System, is the national airline of Denmark, Norway and Sweden. Headquartered in Sigtuna outside Stockholm, Sweden, it operates out of three main hubs, Copenhagen Airport, Stockholm-Arlanda 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 2016, SAS operates 159 aircraft—jetliners and turboprops—consisting of 82 Boeing 737, 20 Bombardier CRJ900 operated by Cimber and Cityjet, 25 Airbus A319/A320/A321, 16 Airbus A330/A340 and 16 ATR 72's operated by Jettime and FlyBe.