I was offered a LM upgrade and decided to purchase it for AC29 tomorrow. I noticed my fare class changed to R which doesn't show up on CO or UA charts. Anyone have any experience with how these credit on AC so I can judge what to expect on UA i.e., original booking class or as another booking class. I hope I didn't screw myself out of plat on CO by buying an upgrade on AC as this is what will put me over for the year!

Thanks!