This looks like you're searching for flights between cities that aren't served by AS on their own metal. AA-operated, AS-marketed codeshares are only available in conjunction with an AS-operated flight. So those of us who aren't in western North America are out of luck; AS has essentially-explicilty told us to no longer use Mileage Plan. For AS frequent flyers, the AA/AS partnership will only useful to get from AS cities to smaller, eastern markets that AS doesn't serve with its own metal (as well as international trips). That's still a substantial utility, but much, much less useful than the AS is now.

Tons of discussion of this in the relevant thread: http://www.flyertalk.com/forum/alask...ry-2018-a.html.