The 739s go from 16/165 to 16/24/138. That means a loss of only 3 economy seats. Given that F is going from 36" to 41" and 24 of those economy seats are getting 3-4" extra legroom (what are they now?), that's going to hurt in the remaining economy seats.

I was just thinking on Tuesday that AS's regular economy seats on the 739 are quite comfortable for me, a 6' person. I guess those days are ending.

Do the exit row seats count as premium class? If so, this may not be so bad, since it would only be 6 seats (one row) of new extra legroom seats, assuming row 6 doesn't need to be changed.

The way this is described, it sounds like a separate booking class like DL's new domestic comfort+. That makes me very nervous about availability for AA elites as well as companions of elites; will it be limited to only one companion, like DL?