If it is 737's they really limit themselves to making a profitable go of things.
Auckland, Wellington, Rotorua, Hamilton, Christchurch, Dunedinm Invercargill, Queenstown
The above are the main centres and having a 700/800 running anything but the Triangle AKL-WLG-CHC will most likley see DJ not do very well. QF can barely get good loads on any of it routes and NZ fills up the 733.
Might be alright for a year or so but the money is going to be in the smaller centres where there is the NZ monoply at the moment like Hamilton, Dunedin, Nelson, Tauranga etc.