Former Hong Kong Airlines director Zhong Guosong announced on Tuesday he had been appointed chairman after a shareholder meeting where he and Chinese private equity firm Frontier Investment Partner, who together control about 61 percent of the shares, voted in additional board members, including Zhong as chairman.
Hou Wei joined Hong Kong Airlines in September last year, having previously worked for units of HNA's Hainan Airlines, China's fourth-largest carrier.
Referring to himself as chairman of the airline, Hou on Wednesday challenged the decision to remove him. In an internal letter sent to employees and shown to Reuters by Hong Kong Airlines, Hou said the board changes were a result of a shareholder dispute and would not have any impact on the company's operations.
"I will continue to work hand in hand with our leadership team to take concrete actions to secure Hong Kong Airlines’ future," Hou said.
Hong Kong Airlines Consultation Service Co., which Zhong controls, and Frontier responded by saying that the April 16 meeting was conducted legitimately under proper procedures supported by multiple legal opinions.
"These steps were taken to secure the financial future of Hong Kong Airlines and stop further related party transactions and any embezzlement of company assets amid a period of significant financial stress and reports of serious financial misappropriation," said the two.
HNA, which holds about 29 percent of the carrier, declined to comment.
The dispute follows another shareholder meeting earlier this month where Hong Kong Airlines executives told investors the company needed to raise at least HK$2 billion (£195.3 million) or risk losing its operating license.
The shareholders reacted angrily, Reuters reported last week, and questioned Hong Kong Airlines' dealings with other HNA affiliates, demanding the company provide full 2018 financial figures before they would consider providing fresh capital.
Formerly acquisitive HNA - a planes-to-banking Chinese conglomerate - has been working to improve its finances since China cracked down on aggressive debt-fuelled foreign dealmaking in mid-2017.
By that point, a $50 billion spree had netted HNA assets including the single largest stake in Deutsche Bank. It has since been reducing its portfolio and last month sold low-cost carrier Hong Kong Express Airways.
On Tuesday, HNA unit CWT International Ltd said it had defaulted on a HK$1.4 billion ($179 million) loan and had less than 24 hours to pay funds due or lose assets pledged as collateral.
(Reporting by Jennifer Hughes, Kane Wu and Julie Zhu; Editing by Muralikumar Anantharaman and Kirsten Donovan)
By Jennifer Hughes and Kane Wu