My experience in Customer Service Industry, and from when things similar to this has happened to me is, if the company in this case being USairways makes the mistake, then you just eat the difference. I would be shocked if after one or two emails they either don't refund the $108 or give you a $108 credit of some sorts. Especially being a CP. Nothing would be worse than to lose a customer whos spends 10's of thousands of dollars over $108 when one of our people made a mistake.