Originally Posted by anon2k2

I've never had this issue with Delta, but a couple of different times while my daughter was in her study-abroad year, she was asked to present the original credit card that purchased her ticket at check-in.

Both times it was at NRT, once on Asiana, and again on Xiamen Air. Since I purchased both tickets from afar, it was a bit of an issue, but ultimately she was allowed on both flights.