Originally Posted by
gcashin
I had a UA ticket last week with an AC segment, and the UA G fare had mapped into an AC K fare, so I'd expect your G fare may be the same. It showed as "Flex" when I'd looked it up with the AC PNR, but it credited as K for mileage and was considered as a K fare for eupgrade requests.
Same experience recently. 016 ticket, operated by AC. Showed as Flex G, and gave me advance seat selection. Later credited as Tango K, and AC's only explanation is that it's due to branded fares.