A is First on 2 class and Premium on 3 Class. If you board a 3 Class Aircraft the agent is supposed to check the fare basis to find which class of service your ticket entitles you to. A DONEW4 Class fare basis is only valid for First on 2 Class planes and Biz on 3 Class planes. A AONEW4 fare basis is valid for Premium.
I have never had a problem with AA on these tickets, but clearly some agents are also confused and you should be prepared to fight for what you are etitled to. Or in your D Class ticket, hope that if you switch to a 3 Class plane the agent just books you in A Class by mistake!!!
rich
rich