I have a question about US domestic round trip travel. The flight is operated by American, but marketed by Alaska Airlines (AS) and the ticket is issued on AS stock (027). The passenger has Platinum status with AAdvantage, one benefit of which is complimentary cabin upgrades on domestic flights. The passenger has no status with Mileage Plan.
Can that passenger request a complimentary status upgrade on the AA-operated, AS-marketed flight? Which airline would the passenger contact?