Airbus's product line is divided into three aircraft families the A320 Family (A318/A319/A320/A321) with 107-185 seats, the A300/A310 Family with 220-266 seats, and the A330/A340 Family with 253-380 seats. In response to market demand for very high capacity aircraft, Arbus is also developing the A3xx Family, starting 555 seats