If you mean the shuttle between the terminals, you take the luggage on board the bus if you do not fly with Air NZ. If you arrive at the international terminal you can check in your luggage after the Customs control if you transfer to a domestic flight with Air NZ. If you arrive on a domestic flight with Air NZ and carry on with Air NZ your luggage gets checked through to your final destination. If you carry on on another airline you take the luggage on the shuttle bus.
If you mean the airport bus to the city, you take your luggage on board the bus.
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