Airbus' product line is divided into three aircraft families-the A320 Family (A318/A319/A320/A321) with 170-185 seats, the A300/A310 Family with220-266 seats, and the A330/A340 Family with 253-380 seats. In response to market demand for very high capacity aircraft, Airbus is also developing the A3xx Family, starting with 555 seats. In 30 years of operation, Airbus has received orders for some 4000 aircraft.