An
airliner is a type of
aircraft initially designed for the
transportation of paying passengers. There may be variants developed for air freight, military or luxury corporate use. Occasionally the military version precedes the civilian airliner. Examples are the
Boeing KC-135 and
Boeing 707/
720[?] series and, looking to the future, perhaps the
Bell-Boeing MV-22 Osprey[?]. Corporate or military use may follow the withdrawal of the
airplane from use as a passenger transport, possibly for reasons of economy or environmental restraint. Most airliners are owned or leased by
airlines.
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