Hello Gang!!!

I'm trying to book non-Alaska Airlines flights with award points from the AA website, but the flights are not showing up.

I' 'm using seats.aero to find available flights, but when I try to book on Alaska Airlines, the flights I want are not displayed (even when I click on "use miles" option to bring up the flights.

How can I display and book flights from Alaska Airlines website but operated by Star Alliance, for example, American Airlines?
I get the same when I try to book through Air Canada and Finnair.
I have AMEX points I want to transfer and use, specifically for American Airlines and United Airlines flights.

Thanks in advance!

Wylie