This type's official name is the A300B4-600. It has more powerful CF6-80 or Pratt & Whitney PW4000 engines, and it has the Honeywell 331-250 auxiliary power unit (APU). The A300-600 began being used in 1983 by Saudi Arabian Airlines The A300-600 also has a different cockpit (similar to the A310), so the flight engineer was not needed for this type.