While American Airlines has a primary partnership with Citi and Barclays for their co-branded AAdvantage cards, many other cards work indirectly through transfer or travel portals. The direct options include the Citi® / AAdvantage® Platinum Select® or the Barclays AAdvantage® Aviator® Red, which earn miles directly into your AAdvantage account. However, since American is not a direct transfer partner of Chase or Amex, you can use Bilt Rewards as a rare 1:1 transfer partner (though check current 2026 status as partnerships shift). Alternatively, any card with a robust travel portal, such as the Chase Sapphire Reserve or Capital One Venture X, "works" by allowing you to book American flights using their respective points at a fixed value (e.g., 1.5 cents per point). Additionally, since AA is a member of the Oneworld Alliance, you can use British Airways or Iberia Avios—which are transfer partners for Chase and Amex—to book "Award" seats on American Airlines flights, effectively making those cards compatible with AA's network.