The Boeing 767 is a twin-engine, wide-body airliner that has been in service since 1982 and is used for both passenger and cargo flights. Key variants include the passenger versions 767-200, 767-300, and 767-400, with the extended-range (ER) versions offering greater fuel capacity and range. The 767-300ER is the most popular variant, and the 767-300F is a dedicated freighter version.