Incredible footage has revealed the moment that the world's biggest jet engine took to the skies for the first time, ahead of its planned maiden commercial flight in 2020. The huge GE9X powerplant, which is as wide and tall as the fuselage of a Boeing 737, is being built for the latest version of the firm's long-haul 777, the 777X 'megaplane'. General Electric has now begun flight trials of the prototype, after delays caused by technical problems stopped tests originally planned for late last year.
