Shareholder Air New Zealand says it is considering its options in light of Virgin Australia's proposed spin-off of its international operations.
Sir Richard Branson's Virgin Group in the UK holds 26 per cent of Virgin Australia and Air NZ has a 19.99 per cent stake.
Virgin Australia last week proposed splitting its international business into a separate, unlisted company, which could free up the domestic arm for further foreign ownership.
Australian flag carriers that operate international services cannot be more than 49 per cent foreign owned.
Air New Zealand chief executive Rob Fyfe said the airline had previously considered the implications of a Virgin Australia international spin-off, when asked about Virgin's move at last Friday's first-half results presentation in Auckland.