The Airbus A321 is the largest member of the A320 family, offering extended capacity and range while maintaining the efficiency and advanced technology that define the series. Typically seating between 185 and 244 passengers depending on layout, the A321 is widely used for high-density short- to medium-haul routes, as well as transcontinental and select transatlantic services in its longer-range variants like the A321neo and A321XLR. With updated aerodynamics, modern avionics, and fuel-efficient engines—especially in the newer NEO (New Engine Option) models—the A321 has become a favorite among airlines seeking to maximize capacity without moving to a wide-body aircraft.