EF lists A0 for all the 3-class AA transcons I looked at (for 13 Mar) and the Cathay trip planner doesn't even list A as an option in the details box. In spite of this is it still trivial to ask the AA rtw desk to free up a first-class seat as part of an AONEx?

Alternatively, has anyone had recent experience with QF108? A year ago there were mixed reports (tho mostly negative) about chances of including this segment without an adjacent QF segment to/from NA.
(It occurs to me that for $125 one could show an adjacent Qantas segment, and then change it after flying the transcon. Except in my case I've already used trans-pacific and I don't suppose they fly the Atlantic.)