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A wide-body aircraft is a jet airliner having a fuselage wide enough to accommodate two passenger aisles, also known as twin-aisle aircraft, with seven or more seats abreast. The typical fuselage diameter is . In the typical wide-body economy cabin, passengers are seated seven to ten abreast, allowing a total capacity of 200 to 850 passengers. The largest wide-body aircraft are over wide,〔Note: See table in this article for wide-bodied passenger-aircraft fuselage widths.〕 and can accommodate up to eleven passengers abreast in high-density configurations. By comparison, a typical narrow-body airliner has a diameter of , with a single aisle,〔〔(【引用サイトリンク】narrowbody aircraft )〕 and seats between two and six people abreast. Wide-body aircraft were originally designed for a combination of efficiency and passenger comfort and to increase the amount of cargo space. However, airlines quickly gave in to economic factors, and reduced the extra passenger space in order to maximize revenue and profits. Wide-body aircraft are also used for the transport of commercial freight and cargo and other special uses, described further below. The biggest wide-body aircraft are known as jumbo jets due to their very large size; examples include the Boeing 747 ("jumbo jet"), Airbus A380 ("superjumbo jet"), and upcoming Boeing 777X ("mini jumbo jet"). The phrase, "jumbo jet", derives from Jumbo, a famous circus elephant in the 19th century.〔Henry Nicholls, "(Jumbo the Elephant goes large )", ''The Guardian'' (November 7, 2013).〕〔Eric Partridge, Tom Dalzell, Terry Victor, ''The New Partridge Dictionary of Slang and Unconventional English: J-Z'' (2006), p. 1128.〕 7-abreast aircraft seats typically 160 to 260 passengers, 8-abreast 250 to 380, 9 and 10-abreast 350 to 480. ==History== Following the success of the Boeing 707 and Douglas DC-8 in the late 1950s and early 1960s, airlines began seeking larger aircraft to meet the rising global demand for air travel. Engineers were faced with many challenges as airlines demanded more passenger seats per aircraft, longer ranges and lower operating costs. Early jet aircraft such as the 707 and DC-8 seated passengers along either side of a single aisle, with no more than six seats per row. Larger aircraft would have to be longer, higher (such as a double deck), or wider in order to accommodate a greater number of passenger seats. Engineers realized having two decks created difficulties in meeting emergency evacuation regulations with the technology available at that time. During the 1960s, it was also believed that supersonic airliners would succeed larger, slower planes. Thus, it was believed that most subsonic aircraft would become obsolete for passenger travel and would be eventually converted to freighters. As a result, airline manufacturers opted for a wider fuselage rather than a taller one (the 747, and eventually the DC-10 and L-1011). By adding a second aisle, the wider aircraft could accommodate as many as 10 seats across, but could also be easily converted to a freighter and carry two eight-by-eight freight pallets abreast.〔 〕 The engineers also opted for creating "stretched" versions of the DC-8 (61, 62 and 63 models), as well as longer versions of Boeing's 707 (-320B and 320C models) and 727 (-200 model); and Douglas' DC-9 (-30, -40, and -50 models), all of which were capable of accommodating more seats than their shorter predecessor versions. The full length double-deck solution was not realized until the twenty-first century, in the form of the Airbus A380. The widebody age began in 1970 with the entry into service of the first widebody airliner, the four-engined, partial double-deck Boeing 747.〔Rumerman, Judy. ("The Boeing 747" ), U.S. Centennial of Flight Commission. Retrieved: 30 April 2006.〕 New trijet widebody aircraft soon followed, including the McDonnell Douglas DC-10 and the Lockheed L-1011 TriStar. The first widebody twinjet, the Airbus A300, entered service in 1974. This period came to be known as the "widebody wars".〔 〕 After the success of the early widebody aircraft, several successors came to market over the next two decades, including the Boeing 767 and 777, the Airbus A330 and A340, and the McDonnell Douglas MD-11. In the "jumbo" category, the capacity of the Boeing 747 was not surpassed until October 2007, when the Airbus A380 entered commercial service with the nickname Superjumbo. In the mid-2000s, rising oil costs in a post-9/11 climate caused airlines to look towards newer, more fuel efficient aircraft. Two such examples are the Boeing 787 Dreamliner and Airbus A350 XWB. The proposed Comac C929 and C939 may also share this new widebody market. 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「Wide-body aircraft」の詳細全文を読む スポンサード リンク
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