Air New Zealand is considering selling all or part of its 26 per cent stake in Virgin Australia, a week after the Australian airline secured a $425 million loan from its four major shareholders.

Air New Zealand, which is Virgin Australia’s biggest shareholder, said on Wednesday that it has retained investment banks First NZ Capital and Credit Suisse to advise on its shareholding options.

Etihad Airways holds a 24 per cent stake in Virgin Australia, while Singapore Airlines holds a 15.6 per cent stake. Virgin Group also holds a stake.