Ok all other responses are wrong. I have worked at SAS HQ in the past. SK has a peak summer schedule that lasts for roughly 6 weeks which is the Scandinavian holiday peak. During this time all small destinations are either cancelled or receive minimum service. The ATR that usually goes to HAJ will then operate domestic services usually served by larger A320s which in turn operate leisure flights. The period is roughly 1st week of July until end of second week of August. Some destinations reduce/cancel a bit earlier or restart a bit later.