It looks as though Air NZ may have lost the plot, with the airline apparently banning the carriage of electronic bag tags, such as the Apple Tag, in checked on bags (references here Air New Zealand, NZ Herald, Stuff). It also looks like an airline decision, rather that being driven by the regulator.
This comes a few weeks after Lufthansa upset a lot of people with a similar ban, but one which was overturned about one week later (NZ Herald).
With all the fuss (reasonable or otherwise) about lost baggage, it would be a real shame if airlines started clamping down on these trackers which, at the least, provide some hope when checked in bags are lost.
May be we'll see a similar backtrack from Air New Zealand soon.