In 2026, American Airlines AAdvantage Platinum status (which aligns with Oneworld Sapphire) provides lounge access, but primarily on qualifying international itineraries. If you are an AAdvantage Platinum member traveling solely on domestic flights within North America, your status alone does not grant access to the Admirals Club; you would still need a separate membership or a one-day pass. However, when flying on an international long-haul flight operated by American or a Oneworld partner, you and one guest can access Admirals Clubs and standard Oneworld Sapphire lounges worldwide. It is important to note that "domestic" itineraries to Canada, Mexico, and the Caribbean have historically been excluded from this perk unless you are in a premium cabin. For guaranteed access on every domestic flight, many Platinum members choose to purchase an Admirals Club membership or use the lounge passes available through "Loyalty Point Rewards" milestones.