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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.
Most airliners today are powered by jet engines: see jetliner.