Singapore Airlines: Briton killed and dozens hurt in severe turbulence BBC.comOne Dead and Dozens Injured After Severe Turbulence on Flight From London to Singapore The New York TimesWhat causes air turbulence and how worried should passengers be? The GuardianSingapore Airlines flight hits severe turbulence, one passenger dead, seven critically injured Yahoo! VoicesSingapore Airlines passenger dead after Boeing jet hits ‘severe turbulence’ Fox Business