Airlines are set to urge aeroplane passengers to wear their seatbelts throughout flights in a new safety push following the death of a 73-year-old Singapore Airlines passenger during extreme turbulence. Safety teams at a number of companies are believed to be considering how best to compel their customers to stay strapped in even if the seatbelt sign is off, according to The Times. Singapore Airlines flight SQ321 from Heathrow on May 21 saw the Boeing 777-300ER aircraft plummet 6,000ft amid...