The first Next-Generation 737-800 is being assembled at Boeing's facility in Renton, Wash. The Boeing 737's reliability and performance have made the twinjet the best-selling commercial jetliner in aviation history. With the Next-Generation 737s ( -600/ -700/ -800/ -900), Boeing has further enhanced its reputation for providing unparalleled value for airline customers. In 2002 the 737 manufacturing process converted to a moving line system, replacing the station to station method of assembly pictured here.