Scandinavian Airlines System (SAS) is a “triple flag carrier”, which has a long history of being the major airline within Scandinavian region and dominating Danish, Swedish and Norwegian markets.
Norwegian Airlines was established in 2007, meanwhile it took several years of aggressive pricing and network expansion before the company became known. In 2016 it introduced a refreshed Norwegian Rewards program, which is not connected with any major airlines alliance.
Here is a summary of the benefits of both SAS Eurobonus and Norwegian Rewards frequent flyer programs, their pros and cons.