Note AA.com doesn't check partners. If you're looking for a domestic award, AS is probably your only other option (if they fly the route you need to go). Additionally, there may be strange routings that are available and AA.com can't find. Try calling AA. An agent may be able to find you something. Otherwise you'll need to be patient and flexible. Try alternative airports, etc. What's your itinerary, what dates are you looking to fly, and do you have any flexibility on those dates?