Scandinavian Airlines System (SAS), 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 February 2021, SAS utilize 164 aircraft—jetliners and turboprops—consisting of 64 Boeing 737, 28 Bombardier CRJ900 operated by Nordica and Cityjet, 44 Airbus A319/A320/A321, 9 Airbus A330, 8 Airbus A350 and 10 ATR 72's operated by Nordica and FlyBe. In addition there are 2 Bombardier CRJ1000 leased from Air Nostrum.