Originally Posted by Kacee

AA's new seats are better, but that's only on the 77W, which is currently in very limited usage. On the whole, DL's international fleet is much more likely to have lie-flats. This is one area in which UA still wins, with 100% lie-flats on long-haul international.

Out of SFO, if you're looking at DL or AA for international, there is literally zero nonstop lift - you'll be connecting through SEA/SLC/DTW/ATL (DL) or LAX/DFW/ORD (AA). So I think the partners become key for international, and IMO AA, with BA and CX, wins this one hands-down.