I don’t think anyone anywhere is arguing many areas in which AC outperforms Delta, though you may be right that the FFP could be a candidate on that count.

When you say AC is “dirt” (or “third world ****” in another post) compared to other NA non-budget airlines, I’m curious in which specific areas your experiences flying DL/UA/AA/B6/AS stick out most as areas in which AC lags behind all the others.

How do you rank your recent travel on DL/UA/AA as a comparison between those three? We’ve accepted DL as a given, but based on your experience, which factors are leading you to choose UA or AA over AC? Short haul or international?