Qantas (21.5 inches), Emirates (18.5 inches) and Etihad (20 inches).

Singapore Airlines' new first class suite for its A380 superjumbos. The suites feature a fully flat bed and a separate leather recliner, allowing passengers to relax upright without having to convert a seat into a bed.

The new first-class suites keeps many of its predecessor's features, including a sliding door and double-bed option for the first two suites in the aisle.

A flight attendant arranges a bed in two adjoining mock-up first class suites.

First class will also feature two spacious toilets, including one with a sit-down vanity counter.

First class will also feature two spacious toilets, including one with a sit-down vanity counter.

A stewardess stands for a photograph next to the 32 inch screen of a Suite, designed by Pierrejean Design Studio,during the unveiling of the new cabins for the Singapore Airlines Ltd. Airbus SE A380 aircraft in Singapore, on Thursday, Nov. 2, 2017. Singapore Air, the first carrier to put a double bed in its cabins, is spending $850 million to refit all its A380 jets to take airborne luxury up another notch. Photographer: Nicky Loh/Bloomberg Photo: NICKY LOH

A flight attendant arranges a bed in two adjoining mock-up first class suites. Photo: Bloomberg

The first class suite is finished in leather. Photo: Bloomberg

A flight attendant with a mock-up first class suite during the unveiling in Singapore. Photo: Bloomberg

A flight attendant poses with a mock up of the first class suite during its unveiling in Singapore. Photo: Bloomberg

A flight attendant poses with a mock up of the first class suite