airBaltic
SAS has a 47% stake in airBaltic. The Latvian government has the rest, except for a tiny portion which belongs to the now defunct Baltic International Airlines. On the whole, the Latvian government owns the majority, but if you fly the airline, it is well advertised that airBaltic is "well connected with SAS."
Basically, airBaltic follow the SAS program. Service is fair, but the food is getting worse rapidly, just like SAS. airBaltic just took their first delivery of a 1991 model B737-500 which it will use on the Riga-Copenhagen run, freeing up some of their three RJ70s to do new runs into Amsterdam and Brussels.
Despite having to fly sophisticated equipment, the airBaltic pilots are being paid much less than an SAS F/O on his first flight. Maybe SAS is looking toward expanding airBaltic and Estonian Air for other purposes than just flying point to point. What if the route included Riga-Copenhagen-Oslo. You pay a pittance more for the Copenhagen-Oslo flight, but you are guaranteed seats because it is cheaper than the SAS domestic flight. They could also pick up passengers in Copenhagen (I hear grumbling).
I'm flying from Riga to Oslo next week for only two days. airBaltic-SAS charged me USD 1,200 because I would not be staying a Saturday night. I checked with Finnair who charged me USD 460 for the same ticket with better connections and they didn't care if I stayed a Saturday night. Take a guess which one I took.
On the other hand, airBaltic is making strides in the cheap ticket market, but you have to be like a rat terrier to get their EUR 87 special one way to Amsterdam. I don't know their general policy, but there are probably only four seats at that price.