Originally Posted by
Beecharmer
Thanks for the clarification, I feared as much. Did pay with the MBNA Emirates AMEX but am thinking they will use flight prices now for J rather than when I booked months ago. Didn’t screen-shot those of course

One option may be to change your flight. What is the route? If it's MAN, then there are normally 2 flights a day with F, plus one 2 class. So, you may be able to shift your flight.