Aircraft leasing company BOC Aviation, controlled by the Chinese state, has become a major shareholder in Norwegian Air Shuttle as part of the ailing airline's rescue plan, Norwegian said Wednesday.

Already faced with a substantial debt burden, the low-cost airline ended up in dire financial straits when the new coronavirus pandemic paralysed global air traffic.

In early May, Norwegian adopted a rescue plan, which included a deal with creditors to convert some of the company's financial liabilities into equity.

The plan enabled the company to strengthen its capital position and meet conditions by the Norwegian state to provide guarantees for 2.7 billion Norwegian kroner ($270 million or 247 million euros) in loans, in addition 300 million kroner in loan guarantees already provided.

Ireland's AerCap Holdings will become the largest shareholder with 15.9 percent of the shares, as well as convertible bonds representing a further 7.2 percent.

BOC Aviation, controlled by the Chinese state through multiple companies, will in turn hold 12.67 percent of the capital.

While welcoming the closure of the deal, Norwegian CEO Jacob Schram cautioned that "the months ahead will remain challenging and with a high degree of uncertainty for the industry." "Norwegian will still need to collaborate closely with a number of creditors as the company currently has limited revenues," Schram said in a statement.