https://i.stuff.co.nz/travel/travel-troubles/300691561/sad-they-didnt-have-systems-in-place-luggage-fails-to-arrive-on-air-nz-first-flight-from-new-york
They had 17 hours to acars the crew to inform the individual pax that their baggage was left behind.....instead they did nothing and let them stand at the baggage carousel until it stopped and then they had to line up at the baggage services desk for an hour or more....after a 17hour flight.
Could have told the pax at top of descent so as to not have them fret for 17 hours but also not waste more time on arrival.....sorry no bags for you, head straight out through customs, expect compensation and your bags delivered to your house on Tuesday.