Citibank and American Airlines AAdvantage® have been partners and have been offering AAdvantage co-branded credit cards for a long time. However, AAdvantage has never been a part of Citi’s ThankYou® Rewards program. Things changed this July, at least temporarily. A long-desired partnership has finally happened. Now and through November 13, 2021, cardholders of qualifying Citi credit cards can convert ThankYou points to American Airlines AAdvantage miles.