Affirm: Available for eligible flight and seat purchases; not available for extras such as baggage. Citi Flex Pay: Eligible Citi/AAdvantage cardmembers can split qualifying flight purchases of $75 or more into fixed monthly payments. PayPal: Available for eligible travel purchases on aa.com and the American Airlines app, except award tickets. PayPal may charge cross-border fees to customers outside the U.S. and U.K. Venmo: Available on aa.com; don't assume app availability is identical. Airport Payments: Cash or check is accepted at some airport ticket counters and travel centers.