A man, whose identity is not yet known, died on a Singapore Airlines (SIA) flight bound forSan Francisco on Saturday.
The cause of death has not been confirmed.
SQ flight 2 was on the way to San Francisco from Singapore via Hong Kong, reported Channel NewsAsia.
According to SIA, the man, who was holding a US passport, was found unconscious 90 minutes before the flight landed.
Three passengers, believed to be in the medical field, tried to provide medical assistance but their attempts at reviving him were unsuccessful.
SIA said it will provide any form of assistance needed by the man's family.