I'm with oliver2002 on the India piece since its one of the few places they can leverage their useless A321LR planes and make a return.

MU used to fly to ARN pre-pandemic, planes used to be full but the product is/was a joke. This was pre-SK joining ST of course.

Clearly there is demand to APAC/China, the TG flights from ARN despite SK leaving *A seem full all the time and to a greater extend with business folks rather than white trash Swedes on their way to the in-laws. CA911/CA912 still does pretty well even without SK connections, I guess primarily due to their ability to fly over Russia and maintain the shortest connections to North East Asia and lowest cost.

I doubt we'll see HKG return as that location is drastically losing its former glory and relevance as a trade hub. Looking at that list of unserved destinations, SK having its own route to SIN would really make a lot more sense and could draw in folks that use TG and QR to get there today. Would provide great connections to DPS, SGN, SYD, HAN, HKG and MNL as well if they keep their peace with SQ. I doubt they make any meaningful money from the CPH-SIN SQ codeshare.