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An aircraft cabin is the section of an aircraft in which passengers travel. At cruising altitudes of modern commercial aircraft the surrounding atmosphere is too thin for passengers and crew to breathe without an oxygen mask, so cabins are pressurized at a higher pressure than ambient pressure at altitude. In commercial air travel, particularly in airliners, cabins may be divided into several parts. These can include travel class sections in medium and large aircraft, areas for flight attendants, the galley and storage for in-flight service. Seats are mostly arranged in rows and alleys. The higher the travel class, the more space is provided. Cabins of the different travel classes are often divided by curtains, sometimes called ''class dividers'', but not on all airlines. Passengers are not usually allowed to visit higher travel class cabins in commercial flights. Some aircraft cabins contain passenger entertainment systems. Short haul cabins tend to have no or shared screens whereas long haul flights often contain personal screens which allow passengers to choose what to watch on their personal screen. == Cabin pressurization == (詳細はaltitude sickness including hypoxia. If a pressurized aircraft suffers a pressurization failure above 10,000 feet (~3,000 meters), then it could be deemed as an emergency. Should this situation occur, the aircraft should begin an emergency descent and oxygen masks should be activated for all occupants.〔(【引用サイトリンク】title=737 Emergency Equipment )〕 In the majority of passenger aircraft, the passengers' oxygen masks are activated automatically if the cabin pressure falls below the atmospheric pressure equivalent of 14,000 feet (~4,500 meters).〔(【引用サイトリンク】title=USATODAY.com – When oxygen masks mysteriously appear )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「aircraft cabin」の詳細全文を読む スポンサード リンク
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