Aircraft cabin

[1] Most modern commercial aircraft are pressurized, as cruising altitudes are high enough such that the surrounding atmosphere is too thin for passengers and crew to breathe.

These can include travel class sections in medium and large aircraft, areas for flight attendants, the galley, and storage for in-flight service.

Full-flat seats in business-class rose from 65% of 777 deliveries in 2008 to nearly 100% of the 777s and 787s delivered in 2017, excepted for low-cost carriers having 10% premium cabin on their widebodies.

LED lighting can support different scenarios like boarding, food service, shopping, branding or chronobiology through simulated sunset or sunrise.

[6] In the mid-2000s, Formation Design Group proposed using the taller wide-body cabins to layer the bed and seat arrangements for higher density.

Revealed at Aircraft Interiors Expo 2012, Factorydesign devised a double-deck system of pods for 30% more density, between premium economy and business class.

It becomes necessary whenever the aircraft reaches a certain altitude, since the natural atmospheric pressure would be too low to supply sufficient oxygen to the passengers.

Passengers in this class have a separate check-in, access to the airline's first-class lounge, preferred boarding, or private transportation between the terminal and the plane.

The most notable is Air Force One, with a private sleeping area, office space and conference rooms for the president of the United States.