Query: 43% of CO2 from commercial aviation was linked to passenger movement in narrowbody aircraft, followed by widebody jets (33%), and regional aircraft (5%).

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Wide-body aircraft <=SEP=> 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 5 to . 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 6 m wide , and can accommodate up to eleven passengers abreast in high-density configurations .   By comparison , a typical narrow-body airliner has a diameter of 3 to , with a single aisle , 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 .   7-abreast aircraft seats typically 160 to 260 passengers , 8-abreast 250 to 380 , 9 and 10-abreast 350 to 480 .

Aircraft lease <=SEP=> Aircraft leases are leases used by airlines and other aircraft operators . Airlines lease aircraft from other airlines or leasing companies for two main reasons : to operate aircraft without the financial burden of buying them , and to provide temporary increase in capacity . The industry has two main leasing types : wet-leasing , which is normally used for short-term leasing , and dry-leasing which is more normal for longer-term leases . The industry also uses combinations of wet and dry . For example , when the aircraft is wet-leased to establish new services , then as the airline 's flight or cabin crews become trained , they can be switched to a dry lease .   50 % of global lessor set are based in Ireland and in 2015 over $ 120b of new commercial aircraft was delivered worldwide . Operating leases of jet airliner accounted for less than 2 % of the fleet in 1976 , then 15 % in the early 1990s , 25 % in 2000 and 40 % in 2017 , with lessors involved in 62 % of second hand mid-life aircraft transactions since 2000 : 42 % in Europe and 29 % in North America .

Environmental impact of aviation <=SEP=> The environmental impact of aviation occurs because aircraft engines emit heat , noise , particulates and gases which contribute to climate change and global dimming . Among others airplanes emit particles and gases such as carbon dioxide , water vapor , hydrocarbons , carbon monoxide , nitrogen oxides , sulfur oxides , lead and black carbon which interact among themselves and with the atmosphere .   Despite emission reductions from automobiles and more fuel-efficient and less polluting turbofan and turboprop engines , the rapid growth of air travel in recent years contributes to an increase in total pollution attributable to aviation . From 1992 to 2005 , passenger kilometers increased 5.2 % per year . And in the European Union , greenhouse gas emissions from aviation increased by 87 % between 1990 and 2006 .   Comprehensive research shows that despite anticipated efficiency innovations to airframes , engines , aerodynamics and flight operations , there is no end in sight -- even many decades out -- to rapid growth in CO2 emissions from air travel and air freight , due to projected continual growth in air travel . This is because international aviation emissions have escaped international regulation up to the ICAO triennial conference in October 2016 agreed on the CORSIA offset scheme , and because of the lack of taxes on aviation fuel worldwide , lower fares become more frequent than otherwise which gives a competitive advantage over other transportation modes . Unless market constraints are put in place this growth in aviation 's emissions will result in the sector 's emissions amounting to all or nearly all of the annual global emissions budget by mid-century , if climate change is to be held to a temperature increase of 2 ° C or less .   There is an ongoing debate about possible taxation of air travel and the inclusion of aviation in an emissions trading scheme , with a view to ensuring that the total external costs of aviation are taken into account .

Airliner <=SEP=> An airliner is a type of aircraft for transporting passengers and air cargo . Such aircraft are most often operated by airlines . Although the definition of an airliner can vary from country to country , an airliner is typically defined as an aircraft intended for carrying multiple passengers or cargo in commercial service .   The largest airliners are wide-body jets . These aircraft are frequently called twin-aisle aircraft because they generally have two separate aisles running from the front to the back of the passenger cabin . These aircraft are usually used for long-haul flights between airline hubs and major cities with many passengers .   A smaller , more common class of airliners is the narrow-body or single aisle aircraft . These smaller airliners are generally used for short to medium-distance flights with fewer passengers than their wide-body counterparts .   Regional airliners typically seat fewer than 100 passengers and may be powered by turbofans or turboprops . These airliners are the non-mainline counterparts to the larger aircraft operated by the major carriers , legacy carriers , and flag carriers and are used to feed traffic into the large airline hubs . These regional routes then form the spokes of a hub-and-spoke air transport model .   The lightest ( light aircraft , list of light transport aircraft ) of short haul regional feeder airliner type aircraft that carry 19 or fewer passenger seats are called commuter aircraft , commuterliners , feederliners , and air taxis , depending on their size , engines , how they are marketed , region of the world , and seating configurations . The Beechcraft 1900 , for example , has only 19 seats .