Apologies for going a tad off topic. In addition to setting a minimum and/or maximum amount for credit card transactions being a violation, it is also a violation to require an additional fee for credit card transactions, right? At least it would seem so based on the contact complaint forms which have that as a checkbox option.

I realize agreements can vary from country to country as laws differ, but would this not apply to low cost airlines such as RyanAir, EasyJet, and others which charge a fee for credit card use?