New Delhi, Nov. 8 -- Singapore Airlines has announced a major cabin overhaul to its long-haul aircraft, including putting in sofas in first class. According to the airline, the upgrades, which are estimated to cost around $1.6 billion, will be rolled out across its Airbus A350-900 and Boeing 777-9 fleets.

The airline on Friday unveiled new cabins in all four travel classes in the biggest and most comprehensive overhaul in its history, with the new seats due from the second half of 2027.

In first class, centre seats convert into what Singapore Airlines calls the largest double bed in commercial aviation. Business class gets sliding privacy doors for the first time on the airline, alongside a fully flat bed.

The investment "underpins our...