Originally Posted by
Becca1007
It's not the difference between coach and mint. It is mint refundable and mint that is shown on the front non-refundable screen.
Almost certainly an error. Refundable is supposed to be a fare differential where it just adds to the basic fare price, similar to how Blue Flex adds to the base Blue fare. If that number is negative something is screwy in the details they loaded for that trip.