KLM has taken delivery of its first Airbus A350-900, a milestone in the Dutch airline's long-haul fleet renewal and the start of a farewell tour for its ageing A330s. There's just one odd catch: the brand-new business class seats aren't certified, so they'll fly empty on the first aircraft in service.

The holdup is regulatory rather than mechanical. KLM says a "revised interpretation of regulatory requirements" by aviation authorities has delayed certification of its World Business Class seats, which use the STELIA Aerospace OPERA platform — the same product already flying on Air France's newest A350s. EASA has now approved the test results, so the certification process can finally begin, but travellers booking the first departures will find premium economy and economy open while business class stays grounded. The manufacturer is working to close it out as quickly as possible.

So what's the plane like? KLM is fitting 331 seats: 34 in business, 26 in premium economy, 33 extra-legroom economy seats, and 238 in standard economy. That's a big jump in capacity from the A330-200s (243 seats) and A330-300s (292) it replaces, and even from the 777-200ERs (316) that will eventually follow the A330s out of the fleet. With Amsterdam Schiphol under slot controls, squeezing more passengers onto each departure makes obvious sense. Notably, KLM's layout is less premium-heavy than Air France's newer A350s, which carry 48 business seats — Paris simply has more premium demand than Amsterdam.

The A350s will start long-haul flying in late October 2026, beginning with Amsterdam to Toronto, then adding Montreal, Kilimanjaro, Dar es Salaam and Zanzibar. At least 22 of the type are due by 2030, part of the wider Air France-KLM order for up to 90 A350s placed in September 2023. Fittingly for a Dutch flag carrier, the fleet has an art-inspired naming theme: the first aircraft is "The Night Watch" after Rembrandt, and the second will be "Girl with a Pearl Earring" after Vermeer.

Why should you care? If you're booked on one of the first A350 routes this winter, expect a modern, quieter, more fuel-efficient aircraft — but don't count on the new business class being ready on day one. If you're redeeming miles or choosing between KLM and Air France long-haul, it's worth checking which aircraft is scheduled: the A350 is the better ride, but the business cabin question is one to watch until certification wraps up. For everyone else, this is a sign of where KLM's long-haul product is heading over the rest of the decade.