Airbus 321 SpiritAirbus 321 Spirit Airlines airplane model. The Airbus A321 is a member of the Airbus A320 family of short to medium range, narrow body, commercial passenger twin engine jet airliners, it carries 185 to 236 passengers. It has a stretched fuselage which was the first derivative of the baseline A320 and entered service in 1994 about six years after the original A320. The aircraft shares a common type rating with all other Airbus A320 family variants,