Yet again I have to point out the Air New Zealand scheme credits you with Air Dollars which can be spent on any AirNZ flight. None of this silly "no more Loyalty seats on this flight", if there are seats for anyone, you can use Air Dollars to pay for them.

If you are on the Air NZ frequent flyer program, you earn air dollars, not points, and you can use these dollars on ANY AirNZ flight, with no limits such as 'available frequent flyer seats'.  If there is space, the seat is yours.