Hi Kempis, there are no partners in Privilege and I dont expect to see them. In my opinion Estonian Air is happy to participate in SAS Eurobonus and Privilege program is "added bonus" for those who fly OV.
OV main assignment is to be regional feeder for SK and LH and all Estonian travel agencys have special long term agreements under witch they can sell negotiated OV/SK/LH/NG/OS/VO joint tickets to different locations in the world (same price, no matter what airlines are used). For example, one can travel from Tallinn to AMS on SAS operated flights via STO or take Estonian Air to STO/CPH and then SK to final destination. Of course Eurobonus members prefer SK coded/operated flights as they want to keep (or reach to) elite status. IMO, OV wants to be more "used" on those feeder routes and Privilege program must motivate passangers to fly their operated flights.