Singapore Airlines flight that hit deadly turbulence fell 178 feet in 4.6 seconds Fox BusinessSingapore Airlines plane dropped 54 metres in seconds, flight data shows The GuardianTurbulence-hit Singapore Airlines flight fell 54 meters in less than five seconds, investigation finds CNBCPassenger on flight with deadly turbulence describes what he experienced CNNSingapore Airlines bans meal service during turbulence after emergency Business Insider