I'm having trouble getting credit for a flight and, after four attempts, am looking for ideas. The back story: Last October I booked a trip to SLC for this past June. When I booked, I noticed that Z fares were cheaper than Flex, so I went for it. Why not? From October to June I went through about 6 itinerary changes. The last one resulted in being downgraded to Y for two of the segments. The total trip was YEG-SFO-SLC returning SLC-DEN-YVR-YEG. All UA except the last segment, booked on AC with code-share flight numbers. The segments in and out of SLC were the downgraded ones, due to an equipment change to single cabin. OK, fair enough. It also meant losing the bonus mileage for the Z fare, though. Stuff happens. Where I ran into trouble was at checkin to come home. I got my three boarding passes and carried on toward my first flight. But I noticed the flight time on the final leg was wrong by about two hours. No worries, I thought, that can be fixed in the MLL. And it was. I got credit a couple of days later for segments 1 and 3, but not for the middle segment. So I went on the Aeroplan site to request credit. I took the information from the boarding pass and a couple of days later got back an e-mail saying something was wrong with the flight number, the class or the ticket number. Checked the ticket number and realized the number printed on the boarding pass wasn't the same as on my itinerary. So, I tried again. Same result. I called Aeroplan to find out what was wrong, and it turns out the flight number on the boarding pass doesn't match the number normally used for this flight. (remember I booked an AC code share, but got a UA flight number on the boarding pass). So the agent tried putting the request in at her end, but gave me the correct flight number be and said to try that if it didn'the work this time. Of course it didn't, so back for another try, this time with the correct flight number. I just got my fourth rejection, and now am completely mystified. How do I get credit for that flight? Any ideas?