Air New Zealand is coming under fire from frequent flyers over a change to its rewards system that requires them to bid for upgrades.
Some who went online to vent their frustrations at the shift over use of airpoints for seat upgrades are predicting travellers will desert the carrier for other airlines.
One Kiwiblog user said it made him and other good customers "nothing more than auction chattels".
"Are you reading this Air New Zealand? Your best customers will leave you because you are treating your best customers like crap - making them bid for better seats."
Under the OneUp system to begin in May, bids for seats upgrade can be placed only a week or more before a flight, and the airline tells people between three and seven days before departure whether their offer has been accepted.