Originally Posted by
njcommodore
You can only do a CO upgrade if it's a CO ticket on CO metal, no code shares.
I don't know if this is entirely true. I have a flight upcoming over X-Mas that was ticketed on .bomb, UA Flight Number, CO operated flight DEN to EWR. Went into the reservation and upgraded my fiancee with miles and the upgrade cleared a few weeks ago.
Last edited by Cuse44; Nov 7, 2010 at 9:07 am
Reason: More info