Originally Posted by
BHammy
Along the way, I found out that the RUCs were not applied to the ATL-LAX and LAX-ATL legs because those two segments were in a different fare class - X instead of V - which probably would require additional RUCs.
RUCs work on X. The problem might be a "broken fare": each segment was a separate fare rather than a through fare. That makes it unclear whether a single RUC should work for both flights.