Just to pile on another couple data points confirming earlier posts, I have two trips booked currently:
- Trip 1 is in WU and has a FCM offer - I can see all available seats, FC, C+, Preferred Main Cabin, Regular Main Cabin.
- Trip 2 is in WU and has RUCs applied, no FCM offer - I have the RUC double seat map. On the "you may only view" seat map, no seats are available in any cabin; the entire plane is grayed out. On the regular seat map, I can only see available seats in the C+ cabin; everything in FC and Main Cabin is grayed out. Viewing the UG list in the app for this trip shows a great many available seats in both cabins, and the flights are still for sale at K and A fares.