A 73-year-old man died of a suspected heart attack and dozens were injured after flight SQ321, flying from London to Singapore, encountered sudden, extreme turbulence while flying over Myanmar last week. A 73-year-old man died of a suspected heart attack and dozens were injured after flight SQ321, flying from London to Singapore, encountered sudden, extreme turbulence while flying over Myanmar last week. Air and Space Accidents and Incidents, Air Transport Industry, Travel Health and Safety Latest business news