For years, Airbus has marketed the A350 around its 'XWB' badge — eXtra Wide Body — and passengers have largely agreed it's one of the most comfortable twin-aisle jets flying. That lead is about to disappear. Boeing's long-delayed 777X family, now heading toward service, will offer a cabin roughly 5.97 metres wide inside, edging out the A350's 5.61 metres.
The gain doesn't come from a fatter fuselage. The 777X keeps essentially the same external dimensions as the current 777-300ER, but Boeing has reclaimed space through sculpted sidewalls, thinner insulation and revised internal framing — about four extra inches of usable width compared with today's 777-300ER, which already beats the A350 on raw cabin width.
Why should a holiday flyer care? Because width translates directly into how airlines lay out seats. Most A350s fly economy nine-abreast (3-3-3) with seats around 18 inches wide. The 777X is designed for ten-abreast (3-4-3) economy, yet Boeing says certain configurations can still deliver roughly 18-inch seats — while some tighter A350 layouts drop closer to 17 inches or less. Both aircraft match on cabin altitude at 6,000 feet, and the 777-9 is claimed to have the largest windows in commercial aviation, electronically dimmable like the A350's.
There's a catch, though: extra width is only as comfortable as the airline using it. Carriers chasing maximum capacity can still cram ten across and shrink aisles and armrests. Meanwhile Airbus isn't standing still — its New Passenger Standard A350 introduces interior tweaks, including provisions for ten-abreast seating on some layouts, though with narrower seats. And the A350 retains genuine advantages: a composite fuselage, proven fuel efficiency, in-service reliability and earlier availability.
The bottom line for travellers: on a long-haul flight, comfort comes down to what your chosen airline does with the space, not the airframe's spec sheet. When 777X deliveries start and the first seat maps appear, check whether your carrier is spending the extra inches on shoulder room — or on another seat per row.
