The aviation unions have slammed Air New Zealand for releasing "misleading information" about planned strike action by its engineers.
Air New Zealand engineers are planning to strike on December 21 - the busiest travel day of the year, putting Christmas travel plans at risk for tens of thousands of travellers.
Savage, the aviation spokesman for E tū, said engineers and logistics workers had voted to issue strike notices in responses to Air New Zealand's demands for cuts to their conditions.
"This is not just about pay. It's about repeated proposals by the airline weeks out from Christmas to pay them less than colleagues who have already settled and to cut into key conditions, including overtime rates.
"This affects line and hangar engineers, but also store workers and aircraft cleaners, who are covered by the same document and who are struggling to get ahead," he said.