AAdvantage is one of the oldest frequent flyer programs and the largest Oneworld alliance member. American's extensive domestic network covers most U.S. cities. For international business class, booking through British Airways Avios (which transfers from Chase and Citi) often yields better value than AAdvantage miles directly.
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Transfers to British Airways Avios 1:1. Use Avios to book American Airlines flights, often at better value than AAdvantage miles directly.