Singapore Airlines will fit different cabin configurations in their A350s.

Singapore Airlines' first tranche A350s will be fitted with business class, premium economy (2-4-2) and economy seating (3-3-3), but not first class.

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"It will be only 3 classes, because of the size of the plane you cannot fragment it too much," said Singapore Airlines Executive Vice President Commercial, Mak Swee Wah.

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However, SQ exec Mak said that later A350 deliveries could include a 2-class version without premium economy and slated for medium-range flights where the ‘better than economy’ cabin has limited appeal.

Source: Australian Business Traveller

"The exact number of A350s for long-haul flights is still something to be pinned down but certainly the 1st batch that will come in will be earmarked for long-haul flights and will have premium economy."

Based on the article “Singapore Airlines to fly Airbus A350 to Amsterdam, Kuala Lumpur, Jakarta” published in Australian Business Traveller.