AA started their premium economy late in 2016, but was probably only on the international flights, they are one of the first to create the premium economy.

I hear a lot of complaints about AA, and I have been on some of the old US Air jets and while they are not sometimes in the best condition I have also recently been on Delta flights that are even worse. I personally prefer AA over Delta, but while not good for most of you on the east coast my favorite for domestic travel would be Alaska Airlines. Good economy plus and their first class is better than Delta or AA, unless you end up with jet (usually wide body and somewhat rare these days on domestic flights) that has lie flat seats.

I put a lot of miles in each year in the air, I do my best to fly well.

Cheers, T