Long-awaited improvements to Air New Zealand's Dreamliner cabins are set to get under way.

New seats, new carpets, new screens and new Business Premier cabins are among the features customers can expect after the planes get retrofitted in Singapore.

The airline's General Manager of Strategy, Networks and Fleet, Baden Smith, says the upgrades will make better use of the space and give customers more comfort.

"It basically has a bit more privacy and a little bit more space and a little bit more storage up there."

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