Originally Posted by
high_maintenance
International. Two tickets - one C, one Y. Couldn't secure seat reservations on the KL website either. The impossibility of upgrading the Y with SWUs or miles and with less than half the Business cabin sold remains a mystery.

Don't know. I think that DL has a special desk for "SkyTeam upgrades" using miles. Out of curiosity, what was the routing?
There does still have to be upgrade availability (as you probably know, different from J availability). If that's not in place, then it doesn't matter how many miles or SWUs you have.