In 2001 , after tough economic times , Braathens was bought by the Scandinavian Airlines System ( SAS ) .
Scandinavian Airlines System were able to keep operating under Scandinavian Airlines System 's name until SAS   became operative 1 April 2005 .
In 2001 , after tough economic times , Braathens was bought by the Scandinavian Airlines System ( SAS ) , although they were able to keep operating under their name until SAS Braathens became operative 1 April 2005 .