Airbus is promoting comfort benefits from a broader seat width in a campaign which appears to be a pre-emptive strike on the impending launch of Boeing’s 777X.

Competing against the A350-1000, the 777X will be a stretch of the strong-selling 777-300ER, which a number of customers opt to fit with 10-abreast seats in the economy cabin.

But the 10-abreast configuration requires 17in (43cm) seats, and Airbus has unveiled research which, it claims, supports its view that a wider seat offers better-quality rest.

Airbus is using the research findings to underline the benefit of its standard 18in seat, which the airframer fits to the nine-abreast A350 as well as the eight-abreast A330.

The 777-300ER has a wider fuselage than either type, which enables it to accommodate the 10-abreast layout by sacrificing seat width – thereby providing additional revenue and improving the per-seat economics.

Emirates, the largest operator of the 777-300ER, configures the type with 10-abreast seating, and Boeing argues that the demand for such configurations on the aircraft is increasing.

It says 10-abreast layouts accounted for 69% of all 777-300ER deliveries last year, up from 46% in 2011 and just 15% in 2010.

But Airbus says the air transport sector should adopt an 18in standard for long-haul flights, and has presented a study undertaken in co-operation with the UK’s London Sleep Centre to back the call.

The polysomnographic test was limited, involving only six passengers in a simulated cabin. But recordings of physiological sleep measurements suggested that, when using an 18in seat against a 17in seat, the onset of sleep came 6min earlier and brainwaves showed fewer and less-frequent disturbances.

"Compared [with] the 17in seat... there’s hardly any disturbances in brainwave patterns particularly in the first half of sleep where we have most of our deep-sleep period," says London Sleep Centre medical director Irshaad Ebrahim. "The different sleep stages... mimic what we’d find in a normal sleep in our own bed."

Airbus head of passenger comfort Kevin Keniston refers to the 17in width as the "crusher" seat, but rival Boeing scorns the airframer’s campaign.

"I'm surprised by our competitor coming out with an arbitrary, obviously self-serving standard for the industry," says Boeing Commercial Airplanes senior vice-president for global sales John Wojick, pointing out that its customers can select various seat widths – including 17.5in and 18.5in – for their aircraft.

"Our objective is to provide the travelling public with a value choice. Many people are very price sensitive and they're looking for the opportunity to go visit family, friends or a vacation site, and they're price sensitive – even if that means sitting in a 17in seat."

Wojick points out that Airbus has conveniently selected its own 18in seat width as the baseline for an industry standard, adding: "Why not demand that everybody has a first-class seat?"

Ten-abreast layouts emerged with the Boeing 747 family, which used a 17.2in seat for dense economy cabins.

When Boeing moved to its next twin-aisle aircraft, the 767, it was able to offer an 18in seat in the type’s relatively narrow 4.7m cabin by adopting a seven-abreast layout. Airbus’s A330, which entered service 12 years later, was designed with a wider fuselage of 5.3m, which allowed an extra 18in seat in each row.

Boeing’s successor in this midsize sector, the 787, increased fuselage width to 5.49m but narrowed the seats back to 17.2in in order to provide a nine-abreast economy configuration. Its larger 777 can accommodate nine-abreast 18.5in seats or 10-abreast 17in seats.

Having abandoned original plans to re-engine the A330, Airbus instead opted to take on the 787 and the 777 by developing its own big twin, the A350, designing an "extra-wide" 5.59m fuselage – broader than the 787’s but narrower than the 777’s – to allow the nine-abreast layout with 18in seats.

Source: Cirium Dashboard