Singapore state investor Temasek Holdings has expressed interest in buying into Chinese conglomerate HNA's Hong Kong-based carriers, Hong Kong Airlines and Hong Kong Express Airways, according to a source familiar with the matter.
However, an investment in the unlisted Hong Kong carriers by Temasek remains subject to a due diligence process that has yet to begin, said the source on condition of anonymity.
The Singaporean investor would likely emerge as only a minority holder in the Hong Kong airlines, which control valuable slots at Hong Kong's capacity-constrained airport, if a deal is completed, the source said.
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Temasek and the debt-laden HNA, an aviation-to-financial services conglomerate, last week signed a memorandum of understanding to explore business partnerships in aviation and logistics.
A second source familiar with the matter said HNA is looking to raise funds for the Hong Kong airlines and Temasek is a potential investor.
Buying into the Hong Kong airlines would help Temasek get an aviation foothold closer to mainland China, in a market dominated by Cathay Pacific Airways Ltd.
Temasek is the majority shareholder in Singapore Airlines Ltd, which sources said was not associated with the potential investment in the Hong Kong airlines.
Temasek, HNA and Singapore Airlines declined to comment.
Hong Kong Airlines and HK Express representatives said their respective airlines would not comment on "market rumours".
Corrine Png, the chief executive of Crucial Perspective, a transport research firm, estimated that Hong Kong Airlines would be valued at around $1.1 billion and HK Express at around $300 million.
The pair combined have about a 10% market share at Hong Kong International Airport, she said.
The ownership structure and finances of HNA's Hong Kong airlines are opaque. In January, HNA-controlled Hainan Airlines Holding Co said it transferred a 55% stake in Hong Kong Airlines to an "independent third party", Frontier Investment Partner, incorporated in the Cayman Islands. Hainan Airlines said last July the deal was structured to avoid future competition issues with the company's mainland carriers.
US filings lodged in 2015 and 2016 show that HNA-linked groups at that time owned 96% of Hong Kong Airlines, which in turn held a 66% stake in Hong Kong Express, with the bulk of the remaining stake owned by HNA-affiliated groups.
Hong Kong Airlines, which in 2015 dropped plans for an initial public offering, has 37 mostly widebody jets with 24 more on order as it expands into long-haul markets traditionally dominated by Cathay in North America and Europe. Hong Kong Express has 24 narrowbodies.
Temasek and Singapore Airlines had previously targeted the Chinese market with a planned purchase of a 24% stake in China Eastern that was rejected by the mainland carrier's shareholders in 2008. The stake, then worth $923 million, would now be valued at $3.4 billion.