The Boeing 737 Classic is a series of narrow-body airliners produced by Boeing Commercial Airplanes, the second generation of the Boeing 737 series of aircraft. Development began in 1979 and the first
A Boeing 737-300, the most common variant, of Southwest Airlines (2007)
The initial 737-300 (foreground) is 9 ft 5 in (2.87 m) longer than the 737-200 (background) and is re-engined with wider and more efficient CFM56 turbofans
Engine inlet of a CFM56-3 engine on a Boeing 737-400 series showing the non-circular design
A 737-300 of United Airlines
The McDonnell Douglas MD-90 is a retired American five-abreast single-aisle airliner developed by McDonnell Douglas from the earlier MD-80. The airliner was produced by the developer company until 199
An MD-90 of Delta Air Lines, both its launch customer and final operator, in 2008
An MD-81 testbed for propfan engines at Farnborough Airshow 1988
China Eastern MD-90-30 showing a bottom view