Scandinavian Airlines System Aktiebolag (, , ), trading as SAS Group and SAS AB, is an airline holding company based at Stockholm Arlanda Airport (ARN) in Sigtuna Municipality, Sweden. It is the owner of the airlines Scandinavian Airlines, Blue1 and 20% of Widerøe. SAS used to own 19.9% of the now defunct Spanish airline Spanair. It also owns the aviation services companies SAS Business Opportunities, SAS Cargo Group, SAS Ground Services, and SAS Technical Services. It holds minority ownership of Air Greenland, Estonian Air, and Skyways Express. SAS Group is partially owned by the governments of Sweden, Denmark, and Norway, with a 21.4%, 14.3%, and 14.3% ownership, respectively. The remaining 50% is held by private owners, of which Foundation Asset Management at 7.6% is the only significant one. The company is listed on the Oslo Stock Exchange, the Stockholm Stock Exchange, and the Copenhagen Stock Exchange.