Website says in small print that if you qualified in 2022 for 2023 Mosaic, it's valid through 12/31/23. But it doesn't say how that relates to the 4 tiers. Would that automatically be Tier 4? This is all so confusing! I've been traveling a ton to a Delta hub this year but there are too many business travelers at that airport for me to benefit from Delta so I'm thinking of going all in on AA in 2024.