that means loggin on BA and book with AVIOS to find US domestic awards on AA. AA is a oneworld partner. similarly, not finding any QATAR OR OTHER PARTNER AWARDS on BA site with Avios.
I find no partner awards what so ever anywhere . Once in a bluemoon, I can find international British airways flight using BA Avios but as you guys know there is a huge fuel surcharge on BA flights booked with BA Avios.

I hope I was finally able to explain in short and simple and clarify.

I have no problem finding awards flights on other sites using their respective miles.