Boeing’s 737 factory at the Renton, Wash., site leads the industry as the most efficient airplane factory in the world. More than 14,500 commercial airplanes (707, 727, 737, and 757) or about 30 percent of the worldwide fleet flying today were built in Renton. According to Guinness World Records, the 737 is the “most produced large commercial jet” in aviation history. Covering 1.1 million square feet of factory space, the 737 program has rolled out over 10,600 of the jets since the program began in 1967. More than 7,000 Next-Generation 737 airplanes were produced in Renton from 1997 to 2019. In 2015, the factory began producing the 737 MAX family of airplanes. The P-8, a Navy submarine hunter and maritime patrol aircraft, and a military derivative of the 737-800, is also built at Renton.