The Boeing 747-400 is an improvement of the 747-300, and is the best- selling model of the Boeing 747 family of jet airliners. While retaining the four - engine wide-body layout of its predecessors, the 747-400 embodies numerous technological and structural changes to produce a more efficient airframe. Its most distinguishing features versus preceding 747 models are 6- foot (1.8 m) winglets mounted on 6- foot (1.8 m) wing tip extensions, which are found on all 747-400s except for Japanese domestic market versions.
The 747-400 is equipped with a two- crew glass cockpit, which dispenses with the need for a flight engineer, along with more fuel -efficient engines, an optional fuel tank in the horizontal stabilizer, and revised fuselage/ wing fairings. The aircraft also features an all-new interior with upgraded in-flight entertainmentarchitecture. As on the 747-300, passenger variants include a stretched upper deck as standard. The model has a maximum capacity of 660 passengers with the 747-400D variant, and can fly non-stop for up to 7,670 nautical miles (14,200 km) with maximum payload, depending on model.
Northwest Airlines first placed the 747-400 in commercial service in February 9, 1989. The 747-400 was produced in passenger (-400), freighter (-400F), combi (-400M), domestic (-400D), extended range passenger (-400ER) and extended range freighter (-400ERF) versions. The last 747-400, a -400ERF, was delivered in 2009.
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