Is it necessary for the holder of a ticketless flight to be able to present the credit card with which they were purchased if asked at check-in. I seem to remember someone saying this caused a problem for them at the airport. I travelled this Summer and was asked on one occasion and not on other occasions. my son is travelling minus his Dad's credit card next week and I'm a bit concerned, eventhough Aer Lingus said he didn't need to have it. What do you think?