Scandinavian Airlines has unveiled a major overhaul of the cabins products on its long-haul flights, including the installation of Wi-Fi on all aircraft.

Seven of the carrier’s Airbus A330 and A340s will receive cabin upgrades, with new seats in all classes, on-demand in-flight entertainment systems and Wi-Fi access.

The first upgraded aircraft is expected to go into service in early 2015, with the majority of the SAS long-haul fleet featuring the new interiors within 12 months.

The airline’s eight new Airbus A350 aircraft, which will be delivered from 2018 onwards, will also have the new cabins.

“SAS customers will enjoy a totally new travel experience in our upgraded cabins.

“The new interior is designed to meet the needs of frequent flyers and substantially enhances our customer offer,” said Rickard Gustafson, president of SAS.

In economy class, the new seats will have a pitch of 31 or 32 inches and come equipped with nine-inch HD IFE screens, power outlets and USB ports.

The premium economy cabin will offer the same amenities but with a 37-38-inch pitch and 12-inch IFE screen, while the business class cabin will offer full flat-bed seats that stretch out to 196cm, plus 15-inch IFE screens.

All business class seats will offer direct aisle access.

SAS currently flies long-haul to New York, Chicago, Washington DC, San Francisco, Beijing, Shanghai, Tokyo and, from August 2014, Houston.