Six of the best... New business class cabins

1 Delta air lines

Delta said it was "redefining international business class travel" when it launched Delta One suites last year. The product includes sliding privacy doors and 18-inch TV screens. It is currently onboard some A350 aircraft on selected routes but will also be introduced on Delta’s B777s.

2 singapore airlines

The airline has spent four years and Us$850million developing new cabins for its fleet of Airbus A380s. Dividing panels that lower to form a double bed across the central seats is 'comfortably' the most notable development.

3 lufthansa

The airline’s new business class won't take to the skies until 2020 when it rolls-out B777-9 aircraft, but seats will be installed in rows of 1-2-1 and 1-1-1, giving passengers a choice of longer beds or seats with double the desk space.

4 qatar airways

Qatar Airways’ Qsuites enable four passengers travelling together to open up their pairs of aft and forward-facing seats to dine or work together in a ‘quad’. Pairs of central seats also convert into double beds. The product debuted on a B777 flying between London and Doha last summer.

emirates 5

Emirates says its new design for B777-300ER aircraft (of which it operates 166) is inspired by the interior of a modern sports car. The seats are 20.5 inches wide and convert into 78-inch flatbeds but, with a 2-3-2 configuration, three passengers in each row are left without direct aisle access.

6 united airlines

The roll-out of United’s Polaris seats is gathering pace with the product now onboard various B777-300ER and B767-300ER aircraft. It joins perks such as enhanced dining and Saks Fifth Avenue bedding that were introduced soon after the summer 2016 launch of Polaris.