Originally Posted by
DeltaFan4Now
Just to prevent confusion, I think they should be looking for an I fare... In addition, the FO will be much happier riding up front!
I think it should be a "Z-fare" as that is the WBC "holiday fare". It does have a minimum stay and needs to be purchased 30(?) days before travel.
If the family member of the OP has booked a full-fare economy which is booked into the X-bucket you might find that the Z-fare is actually cheaper for quite a few destinations.
Gajan