SAS AB (Scandinavian Airlines System Aktiebolag)[2] (OSE: SAS+NOK, Nasdaq Stockholm: SAS, SAS DKK), trading as SAS Group, is an airline holding company headquartered in the SAS Frösundavik Office Building in Solna Municipality, Sweden. It is the owner of the airlines Scandinavian Airlines and Scandinavian Airlines Ireland. SAS once owned 19.9% of the now defunct Spanish airline Spanair as well as shares in Estonian Air and Skyways Express.