Interesting C+ buy-up comparison for upcoming travel (different PNRs)
JFK - SFO: $145 (base ticket ~$600)
ATL - BRU/BRU - ATL: $99 (base ticket $550)
I know it's because TATL is not a separate fare class but still interesting since ATL - BRU is ~65-70% longer. No F offer on either yet though ATL - BRU is the only one I'd even consider biting on since the other two are daytime.