The new Boeing 777X will be the world’s largest and most efficient twin-engine jet, unmatched in every aspect of performance. He claimed that the lower structural weight of the A350-1000 (35t lighter) would outpace the 777-9 on ultra-long-haul routes. The Boeing 777 8 which will compete directly with the Airbus A350 1000, will carry around 350 passengers over a … Photo: Airbus. The two variants of the Boeing 777X on offer, the 777 8 and 777 9, will enable versatility for airlines, matching passenger volumes and route distance as required. The A350-1000 has some great operational characteristics but lacks the capacity of the 777X. The Airbus CCO, Christian Scherer, said in Paris last year that a 10-abreast A350 would be ‘uncatchable’ by the 777X in terms of per seat economy. With new breakthroughs in aerodynamics and engines, the 777X will deliver 10 percent lower fuel use and emissions and 10 percent lower operating costs than the competition.