Originally Posted by
perseus11
Or you could book the A350 to PHL and then a AMR/US in F non-stop to PHX. I assume that a through booking DOH-PHL-PHX in J will automatically give you "F" on the connecting PHL-PHX flight, of which there are quite a few each day..
But at what price (to book all the way to PHX which I think is what you're suggesting)? US based airlines are known to charge their partner airlines a lot for beyond gate access so fare will probably go up proportionally?
If OP wants to do what you're suggesting, OP could do it from BOS as well - AA has several non-stop BOS - PHX flights throughout the day.