The Airbus A319-100 is a narrow-body airliner that is part of the A320 family of aircraft. The A319 is most notable shorter than the A320 and therefore has fewer seats. The A319 has one emergency exit door over the wings making it easy to distinguish it between other aircraft in the family. With the introduction of it's successor, the A319-100neo (New Engine Option), the current variant is sometimes refereed to as A319-100ceo (Current Engine Option). Both variants are in production however neither variants have many outstanding orders left to fill. This aircraft is ideal for short, medium, and some long haul routes that have low to medium 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 however some airlines use them exclusively.