Originally Posted by
Dovster
I am going back three or four years but when I wanted to change a K fare to an M fare in order to be able to use miles to upgrade on a trans-Atlantic itinerary, I was told I would have to pay the change fee.
That has been my experience as well. I think the key is keeping the same flights... I frequently change return flights and pay the fee even when the new flight is booked in a higher fare bucket. There are not too many reasons why I would change to a higher fare bucket on the flight I am already on.