Just to add to what Mwenenzi and Himeno have said:
Because you already have confirmed flights, AA will have to 'protect' you from the change, which can mean:
- allowing you to exceed the 16 segment limit of the ticket in order to get to and from ANC
- allowing you to fly the AS non-stop PHX-ANC flight, which runs three days per week, even though this is not allowed under the ticket rules
It is not however under any obligation to make sure you get the same number of BAEC tier points that you would otherwise have earned.
(Perhaps AA codeshares on the AS non-stop, and would that mean you earn as you expected?)