If anyone can answer this question, it would be very helpful for me.

I am AA exec platinum thus Oneworld Emerald. I know I get lounge access with certain international flights and of course business flights. I was once turned away from Admirals Club lounge on arrival in SFO from Asia as I'm waiting for an Alaska flight from SFO to LAS.

Would an Alaska Airlines ticket allow me to access the lounge at other airports, for example, LAX upon AA international arrival? I was confused at the time, but now it seems like SFO Admirals Club has an exception to Alaska Airlines. I often need to book a connecting flight from LAS to SFO or LAX and would like to know if AS would be an option or if it has to be AA.