ZED tickets are based on mileage and are accepted by all airlines you have an agreement with. You should check travelnet or ask your partner what the procedure is in terms of finding out who you have agreements with and how to get the tickets.

The good thing is they are refundable, so they are handy to have as a backup

EDIT - I should refresh before I post! Left this one open an hour and like 3 people had responded haha