"We believe Nanshan Group will be a very strong, positive and complementary shareholder for Virgin Australia," said Air NZ chairman Tony Carter.
"The sale will allow Air NZ to focus on its own growth opportunities, while still continuing its long-standing alliance with Virgin Australia on the transtasman network".
Matthew Goodson, Salt Funds Management managing director, said the market was expressing approval of the sale. "There's a sense of relief that Air NZ has managed to extricate themselves from most of their stake in Virgin at a decent price. There has been some concern that Air NZ might not be able to sell the stake, or sell, but at a distressed price," Goodson said.
"If you look at Virgin's balance sheet, it certainly does have a small amount of equity. I think this is a good deal for Air NZ to move on. That's the market reaction," he said.
"The key thing is now what Air NZ does with the money. They have plenty of imputation credits. Will they pay a special dividend?"
The Sydney Morning Herald has reported Air NZ is expected to use the sale proceeds to pay a special dividend to its shareholders, which include the Government with a 53 per cent stake.
UBS said it believed net proceeds from the shareholding sale should be around 2c a share.
After a Virgin Australia capital structure review, Air NZ should also get its A$131 million shareholder loan to the Australian airline repaid.
"After both events we believe [Air NZ] will most likely return net proceeds from the [Virgin Australia] shareholding sale to its shareholders via special dividend," UBS said. "While exact timing is difficult to judge, we expect this to occur before the end of August."
However, Deutsche Bank analysts said with Air NZ still having $2.3 billion of new aircraft expenditure to fund through to 2019, they would not be surprised to see the board adopt a cautious approach to capital management for now.
The divestment would reduce Air NZ's debt gearing levels by around 4 basis points, they said. Reported gearing was 53.8 per cent in the first quarter of 2016, which is near the top of its 45-55 per cent target range with capital expenditure skewed to the first half.
Air NZ said it had "no comment" to make on a special dividend payment.
The Deutsche Bank analysts said accounting-wise, they expected material mark-to-market losses on disposal of Air NZ's full stake, which had a carrying value on its books of around $400 million in the first quarter of this year.
Air NZ and Virgin formalised an alliance in 2010 with codesharing agreements on transtasman and connecting flights and reciprocal frequent flyer and lounge access deals. The tie-up was first mooted in response to Qantas' two-airline strategy where its low-fare Jetstar unit operates domestically in NZ and links to longer-haul flights on its parent.
Nanshan is a large, privately-owned Chinese conglomerate with interests across a diverse range of industries including its own emerging airline, Qingdao Airlines, launched in April 2014.
The sale is subject to and will take place after receipt of Nanshan Group regulatory approvals from Chinese authorities.
Keeping the stake below 20 per cent prevents the triggering of regulatory approvals required under Australian law.
Air NZ shares closed up 5c yesterday at $2.22.