I've seen a few complaints about the JC rosters/conditions. My original thought was that with their schedule of only 8 738's only doing TT flights that it would be a simple case of the rosters rotating through the possible morning NZ-OZ-NZ flights and then the afternoon/evening NZ-OZ-NZ with a couple of overnights in WLG, CHC, SYD ending in the dreaded AKL-MEL-AKL redeye. However I guess its not that simple in that if you operate into CHC, WLG at midnight, you aren't flying out again first thing next morning (well I hope you aren't). Then throw in problems of a small potential pool of standby.
I suspect to get nicer rosters they need to get a bit more critical mass and somehow merge the 8 JC and similar sized JQ TT/NZ fleets together (and pick a common type 738 or 320 in doing so) so you have at least 3 aircraft overnighting in both WLG and CHC so that a crew based can be sustained in WLG,CHC as well as a larger crew base in AKL.