A stretched version of the Boeing 787 Dreamliner has been rolled out by the US manufacturer.

The 787-10, the longest model of the Dreamliner family, is designed to grow the long-haul services opened by the 787-8 and 787-9 with “unprecedented” efficiency, Boeing claims.

As an 18-foot stretch of the 787-9, the 787-10 will deliver the 787 family’s long range with up to 10% better fuel use and emissions than rivals.

Boeing aims to deliver the 787-10 to airlines from next year, with Singapore Airlines the launch customer.

The aircraft, which is due to complete its first flight in a few weeks time, has won 149 orders from nine customers across the globe.

The 787 family of aircraft has flown more than 140 million passengers on 530 routes around the world, saving an estimated 13 billion pounds of fuel since entering service in 2011.

Kevin McAllister, Boeing Commercial Airplanes president and chief executive, said: “We know our customers, including launch customer Singapore Airlines, are going to love what the 787-10 will do for their fleets, and we can’t wait to see them fly it.”