Originally Posted by
travel_mav
No, since the card only grants you access to the Admirals Club when flying AA/US.
Side note: You might be able to access some AS Board Rooms (such as the one in SEA) using the Priority Pass card that comes with your Prestige.
I can attest to this one, I fly AA and/or Alaska out of Seattle fairly frequently. I use the Priority Pass for the Board Room, but they don't take Prestige.