The A320-200 is a narrow-body aircraft that is original model of the A320 family. The Airbus A320 is one of the most popular airplanes in the world and it rivals Boeing's 737 series in many aspects. The A320 has two emergency exit doors over the wings making it easy to distinguish it between other aircraft in the family. The A320-200 is still in production. It can easily serve short, medium, and long haul routes that have medium to high demand and can easily be interchanged on routes that A321 aircraft operate. With this flexibility, airlines commonly operate both types of aircraft to give their narrow-body fleet flexibility however some airlines use them exclusively.