Air New Zealand says it will appeal the Commerce Commission ruling against its proposed alliance with Qantas.
Air NZ chairman John Palmer said the national carrier, along with Qantas, had received advice that the commission's decision was seriously flawed.
They lodged their appeal with the High Court today, he said in a statement to the New Zealand Exchange.
Last month, the commission said a tie-up between Air NZ and Qantas would be anti-competitive, restrict tourism rather than boost it, and increase fares for no national benefit.
Under the airlines' proposal, Australian-based Qantas would have taken a 22.5 per cent stake in Air NZ for $550 million, and Air NZ would have gained control of both airlines' flights to, from and within New Zealand.