You should be able to get DEN-YVR-ICN on 016 ticket stock. Might be difficult, but should be doable. Once you have 1 UA segment (doesn't have to be UA operated) in there with e.g. google flights you should be able to punch-out to United and buy that ticket on 016 ticket stock ... if you need PQDs. Otherwise, AC earns 275% of the distance flown ... not bad.