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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.