The point of my posting was to highlight that in NZ it appears the term 'airway' is used differently than in Europe (or the ICAO definition).
If you look at H249 near TIMARU VOR, it is charted for all the world the same as an IFR airway (on Skyvector), but is clearly in class G, and is provided with an ATService, but not ATControl (possibly logically similar to the way the UK provides procedural control in uncontrolled airspace).
The difference clarifies 27/09's comment about always on airways but mostly uncontrolled.
In NZ, there appear to be very few airports without an approach that have surrounding terrain that would be suitable for non-Darwin Award winners to undertake a DIY approach.