The newest members of the Boeing 737 family -- the 737-600/-700/-800/-900ER models -- continue the 737's pre-eminence as the world's most popular and reliable commercial jet transport. The entire 737 family has won orders for more than 6,000 airplanes. No other jet airplane in commercial aviation history has achieved the sales success of the 737. The 737-900 is nearly nine feet (2.7 meters) longer than the Next-Generation 737-800, the largest model in the Boeing Next-Generation 737 family.