The A321-200 is a narrow-body aircraft that is a shorten variant of the A320 thus making it part of the A320 family. The A321 has many similarities to the A320 but notably it has more seats. The A321 has two emergency exit doors placed just before and after the wing making it easy to distinguish it, along with its size, between other aircraft in the family. The A321 is still in production. This aircraft is ideal for short, medium, and long haul routes that have medium to high demand and can easily be interchanged on routes that A320 aircraft operate. With this flexibility, airlines commonly operate both types of aircraft to give their narrow-body fleet flexibility.