Flag carrier Air New Zealand on Thursday announced a roughly US$300 million annual net loss after demand plummeted due to the coronavirus pandemic.

The virus-driven decline spelled a NZ$454 million (US$300 million) hit, including the cost of redundancies and the mothballing of its fleet while international borders remained closed.

Passenger revenues plunged 74 percent in the final quarter of the financial year.

"The airline has responded to this crisis with urgency, including securing additional liquidity, (and) structurally reducing its cost base" it said.

Flag carrier Air New Zealand announced a roughly US$300 million annual net loss after demand plummeted due to the coronavirus pandemic
Flag carrier Air New Zealand announced a roughly US$300 million annual net loss after demand plummeted due to the coronavirus pandemic AFP / Marty MELVILLE

The airline said the loss recorded over the 12 months to June 30, which compares to a NZ$276 million profit for the previous year, was driven by one-off costs.

Air New Zealand has previously said at least one-third of its 12,500 workforce are expected to lose their jobs due to pandemic-related cutbacks.

It said "cash burn" averaged approximately NZ$175 million a month from April to June but efforts were underway to reduce the monthly figure to NZ$65 million.

The carrier said the uncertainty surrounding travel restrictions meant it was unable to provide specific earnings guidance for the coming financial year.

"However, each of the scenarios we are currently modelling suggest we will make a loss in 2021," it said.