The airline said the average income of the workers planning to strike was NZ$115,000 ($79,085), what it said was more than double the average wage in New Zealand.
It said the group had so far rejected proposals for an immediate 2 percent pay hike followed by further 3 percent increase after a year, with another pay review in mid-2021.
They have also declined a proposal to standardize overtime pay to 150 percent of regular pay rate and a corresponding $6,400 one off payment to address the change in rate, it said.
"The news is extremely disappointing and it appears the engineers are deliberately using Kiwi families' much anticipated Christmas holidays as a bargaining chip," the company's general manager of aircraft maintenance division, Viv de Beus, said. "We remain committed to working closely with the engineers' unions to reach a reasonable agreement and avoid strike action if at all possible."
Customers booked to travel on the regional turbo-prop aircraft fleet will not be affected as this fleet is maintained by a separate work group, the company said.