Bank Charges/Credit Card Charges
The airlines make an absolute fortune out of so called bank charges and credit card charges. The scale of business that the airlines have is such that they should be able to get credit card charges of about 1.2% so that so little in relation to £/€5 each way.
Laser and Maestro fees are about (to the airlines) 19c per transaction.
So one can see the level of revenue generated from this activity.
EI-BUD