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A Boeing 737-300 narrow-body aircraft

An airliner is a type of transportation service for transporting passengers and air cargo. Such aircraft are most often operated by airlines. The largest airliners are called "wide-body aircraft". 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.[1] 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 aircraft" or single aisle aircraft. These smaller airliners are generally used for short to medium-distance flights with fewer passengers than their wide-body counterparts.[1]

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