United seems to hate it when I add segments to refundable tickets because my CC (and everybody elses) is declined. It is something screwy on their end.

Anyway, I have had to go to the airport to pay the measly segment fees of $3.60 in cash. UA seems very lazy with the cash situation and kinf of end up throwing it somewhere on the counter. However, they seem to like the accounting because they wouldn't accept a 5 for the 3.60. They make me go and break it at a snack bar and go count it out down to the penny. VERY Annoying.

Just my two cents