A 45-year-old Hong Kong woman was on board the Malaysia Airlines plane, the Immigration Department confirmed yesterday.
Lui Ching was listed as a Chinese national on the passenger manifest.
A source close to the department said the woman arrived in Hong Kong on a one-way permit and had obtained residency after spending seven years in the city.
The source said there was a spelling issue with her name that meant she was not identified as a Hong Kong resident in the initial period after the plane went missing.
The department said the woman's family had not asked for assistance.
But the immigration section of the Hong Kong government's Beijing office said it would reach out to her relatives, who were now in Beijing, and would provide assistance.
The Immigration Department said it would continue to monitor the situation and work closely with the office of the Commissioner of the Ministry of Foreign Affairs in Hong Kong, the Chinese embassy in Malaysia and the airline.