At least one odd thing in my case is that I could log in to my OP account on co.com and check my itineraries and both the UA and CO legs of the itinerary were there but when I checked in neither boarding pass showed my OP # or my status (Co plat/*A gold), so somehow there was a disconnect from the account and the FF#/Status. Baffles me how that could be, but there it is. I called and had it fixed so I'd at least have my early boarding, and soon after I got my 5-day advance upgrade on my return flight. Does make me wonder if I'd have gotten my outbound upgrade if I'd known my status was not attached to my itinerary. I assumed (natch) that since it showed up under my OP account it would have my OP# and status attached but not so -- somehow they're tracked separately in the system. I only found out when I printed the boarding pass and saw that the OP# and status weren't there.