I finally pulled the trigger on SIN-DPS via the UA website (both SIN-DPS and DPS-SIN are carrying SQ flight numbers), but since the tickets are issued in full Y, I was going to throw some miles and see about upgrading into C.
The question is, do I just need to call MP to process the upgrade or do I need to follow more steps? Also, does a Y>C upgrade pull from I or O class?
PS: the UA website even allowed me to select seats for both segments.
