Originally Posted by
Kacee
It does not carry over. If you do the change by phone, an agent might or might not apply it to the new flight.
So the advice is to hang up and keep calling until you find an agent who applies it to the new flight? [I am booked on a W fare ORD-IAD-AMS with a waitlisted GPU but would prefer ORD-AMS direct when that flight appears to have many more open J seats 24h before.]