PHX-ANC has been year round, picked up from US. They may be making it seasonal like the DFW-ANC flight.

They used to have a ORD-ANC seasonal as well, I had been planning on booking it and was about to confirm the trip plan, when they canned it (was going to do ICN-HKG-ORD-ANC as the start of a DONE3).

AS can't be used on an xONEx (though can be used on an xGLOBnn), however, I've been able to use them in the past (LAX-PDX on a QF codeshare just after the current booking tool was put up). The flight appeared in the booking tool, I selected it and it was ticketed. When AA noticed (ticket issuer), they let it stand.