Originally Posted by
rufflesinc
Yeah, I want to take advantage of that to visit west coast but just not practical to burn more vacation days on top of the long stay in asia

Doesn't have to be as part of the same trip! If you pay the $125 change fee, you can add that final domestic segment even up to day of departure for your first flight, all the way out to the end of AS's schedule. Look at it as a free transcon one-way if you can nail down a date for one, say, six months in the future.