Salaries for Air New Zealand's top executives have been frozen for the next year as the company battles costs.

The airline has under way a process to carve 5 per cent from overhead costs of support services in response to a dip in demand growth that emerged late last year. It has also been hit by rising operational costs, mainly fuel.

Chief executive Christopher Luxon has told staff that as part of the overhead cost review, the nine-member executive had chosen to freeze salaries for the next 12 months.

Luxon, whose total remuneration was $4.6 million in the 2017-18 financial