Originally Posted by
guv1976
AA and B6 both accept PayPal for tickets purchased online. One can link one's bank account (and/or credit card) to a PayPal account.
I've been asked to present the same physical CC I used to buy tickets upon check-in during several occasions. If I hadn't been able to produce it, I'm guessing a short call to Citi would have cleared things up, but having it spared me of this drill.