July 20, 1998 -- Dressed in a commemorative banner, the 100th Next-Generation 737 moves through the 737 final assembly building at the Boeing Commercial Airplane Group manufacturing plant in Renton, Wash. The airplane -- a 737-600 destined for Scandinavian Airlines System (SAS) -- marks a major milestone for the record-breaking program. The Next-Generation 737 family continues to be the fastest-selling jetliner model in aviation history. Since the program's launch, 44 customers have placed orders for 950 Next-Generation 737s. In 2002 the 737 manufacturing process converted to a moving line system, replacing the station to station method of assembly pictured here.