Scandinavian Airlines System Aktiebolag (OSE: SAS+NOK, OMX: SAS, SAS DKK), 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.