Ryanair's is interesting, unlike say BMI which gives milage on purchases, and then a bonus on BMI purchases, there is nothing for someone who would not take very many Ryanair flights. It is something which is only really of use to book them. I wonder what the rationale behind this is, or is it just a reliance that people want a min number of cards, and if they get something free with one they will stick to it?

P