Credit card processing fee

I booked some flights online for my family and got charged a $14 credit card processing fee but here's the catch, you don't know how much the processing fee is until you confirm & pay for the flights. I rang F*&$STAR (sorry that's there new name) and the woman on the phone told me that they charge per person per carriage. So it cost $3.50 each for my husband & myself plus $3.50each way up & back. What a load of shit, it's highway robbery.