Has anyone tried using A444491 in Europe ? The discount is amazing, but what is the danger of the airport office (in Spain) asking for proof of entitlement ?
I regularly book using Cayman as my home country (although UK based Cayman produces significantly lower rates) and have never had a problem, although my personal info on the booking shows as my UK address. So I guess the airport agents either are not alive to the address discrepancy or don't care. Overall I get the sense that because they are usually so busy and understaffed, they really just want to process people as fast as they can.
I have a code I am actually entitled to use - not nearly as good as A444491 - and have never once been asked to justify its use.