Boeing 737
Southwest Airlines Boeing 737-700 landing.
Role	Narrow-body jet airliner
National origin	United States
Manufacturer	Boeing Commercial Airplanes
First flight	April 9, 1967
Introduction	February 10, 1968 with Lufthansa
Status	In production
Primary users	Southwest Airlines Ryanair Continental Airlines American Airlines
Produced	1968–present
Number built	6,605 as of November 2010[1]
Unit cost	737-100: US$32 million[2] 737-600: US$56.9 million[3] 737-700: US$67.9 million 737-800: US$80.8 million 737-900ER: US$85.8 million
Variants	Boeing T-43 Boeing 737 Classic Boeing 737 Next Generation