Yes, Alaska Airlines and American Airlines have a very strong and strategic partnership that was significantly deepened when Alaska Airlines joined the oneworld alliance on March 31, 2021. This partnership allows for extensive codesharing, meaning you can book a single itinerary that includes flights on both airlines. Members of the Alaska Airlines "Mileage Plan" and American Airlines "AAdvantage" programs can earn and redeem miles on either carrier’s flights. Furthermore, elite status members enjoy reciprocal benefits, such as priority boarding, free checked bags, and access to premium seating like "Main Cabin Extra" on American or "Premium Class" on Alaska, depending on availability and status tier. One of the most valued perks is reciprocal lounge access; for example, certain high-level elites or members of the Alaska Lounge program can access American’s Admirals Clubs when traveling on qualifying itineraries. This partnership essentially creates a massive domestic and international network, allowing Alaska to offer its West Coast-based customers easy connections to American’s extensive East Coast and international hubs.