- End of the AS-AA partnership. I'm low-tier in both programs, but would have pretty easily been mid-tier in AS in 2018 if I could still post all of my regular domestic AA travel to AS. (I"m a relative newcomer to actually flying AS metal, but I like it so far.)
- Although it happened earlier in 2017, I imagine I'll feel the pinch of the big HH devaluation when I go to redeem my next 5-night award, sometime later this year.
- I won't affect me until Jan 1, 2019, but I'll miss the ability to throw one Marriott Travel Package every 2 years at Southwest and have a perpetual Companion Pass. I don't use the CP as much as hardcore WN fliers do, but my wife and I get a few short weekend trips around the U.S. every year using it. (Maybe 6 to 8 free roundtrips a year to the east and west coasts...) The more difficult part is finding the Marriott we actually want to spend 7 consecutive nights in.
- Losing the AA lounge access with Citi Prestige stings a bit, but I've warmed up enough to Priority Pass (especially in airports with partner restaurants) that I don't miss it too much.