Originally Posted by
Often1
If you were in paid F, you are also entitled to a refund of the fare difference between F and Y. If you were on some form of discounted FC fare or anything else, the refund will be little or nothing.
Unfortunately, this is where it pays to be pushy.
The fare difference should be that at the time of ticketing, so even with FCM it's a little bit of money (almost all the time).