ok so what benefits do I get on American?
As an Alaska Airlines MVP® Gold, you'll enjoy these benefits:
Priority AAccess™ Check-In when traveling on American Airlines
Express Security Lines at Select Airports.
Priority Boarding on Alaska Airlines, American Airlines, and Delta Air Lines.
Checked Baggage Fee Waiver for first two bags on Alaska Airlines, American Airlines, and Delta Air Lines for MVP® Gold member and persons traveling in the same reservation.
Preferred Seating on Alaska Airlines, American Airlines, and Delta Air Lines.