Goh Choon Phong said his airline is cooperating with investigations into the incident and apologised for the "traumatic experience".
British grandfather Geoffrey Kitchen, who was travelling to Australia with his wife, died - reportedly from a heart attack - when flight SQ321 was hit by the unexpected turbulence.
"We are deeply saddened by this incident. It has resulted in one confirmed fatality, and multiple injuries," he said. The flight from London, which was bound for Singapore, made an emergency landing in Bangkok, where the local Samitivej Srinakarin Hospital said it had treated 71 passengers.
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