The Kiwi flag carrier is Virgin Australia's largest shareholder, with a 25.89 percent stake worth about Aus$343 million (US$262 million) built up as the airlines forged an alliance against trans-Tasman rival Qantas.
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But Air NZ "does not want a large minority equity position in Virgin Australia as it focuses on its own growth opportunities", chairman Tony Carter said in a statement to the New Zealand stock exchange.
"Air New Zealand advises that it is exploring options with respect to its shareholding in Virgin Australia including a possible sale of all, or part of its shareholding," the airline said.
As a result, it said Air NZ chief executive Christopher Luxon has resigned from the Virgin Australia board with immediate effect.
"We look forward to continuing our partnership on the Tasman alliance," Luxon said.
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Virgin Australia noted the announcement and pointed to its "strong" result for the six months to December 31, which included a Aus$45.7 million interim net profit.
"Virgin Australia has undertaken a major transformation program that has seen it evolve from a low-cost carrier to a diversified airline group," it said.
When it released its half-year results this month Virgin Australia also announced it had secured Aus$425 million in loans from its four major shareholders -- Air New Zealand, Etihad Airways, Singapore Airlines and Virgin Group.
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Air New Zealand shares closed up 0.35 percent at NZ$2.86 in Wellington, while Virgin Australia shares were in a trading halt on the Sydney exchange for the announcement.
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