Credit cards at check-in.
I think that there is a seperate thread for this. Anyway, when you book you are asked to take the credit card with you, whether or not it has expired. As far as I have been told, the banks actually ask for this. If you do not have the card, the staff will try their utmost to sort it out by other means of confirming identity etc (billing address of the card is one question that is asked). It is only as a last resort that a new ticket has to be purchased, the old one being fully refunded to the old card.