Air New Zealands main hub is NZAA(Auckland)
They currently operate the B747-400, B777-200ER,B767-300ER(that is going to be replaced by 787s-air nz is the launch customer of the 787-9), A320, B737-300(phasing out), ATR-500, Q300, S340A(phasing out), Beech 1900D.
Air New Zealand operates the 747,777,767, and a320
Air New Zealand National Operates the 737
Mount Cook Airline operates the ATRs from Christchurch
Air Nelson operates the S340A and Q300 from Nelson
Eagles Air operates the B1900D from Hamilton
Air New Zealand operates to 26 Domestic Destinations, 6 Australian Destinations, 9 Pacific Island Destinations, 5 Asian Destinations, 3 USA Destinations and 1 European Destination.
They are the only airline to operate a true around the world service as they serve London via both Hong Kong and Los Angeles therefore making it possible to travel around the world on one carrier
Any more questions I would be happy to answer
Cheers