Airbus is one of the world's leading aircraft manufacturers, and it consistently captures approximately half or more of all orders for airliners with more than 100 seats. Airbus' mission is to provide the aircraft best suited to the market's needs and to support these aircraft with the highest quality of service. The Airbus product line comprises 14 aircraft models, from the 100-seat single-aisle A318 jetliner to the 525-seat A380 - which is the largest civil airliner in service. As of December 31, 2009, combined orders for Airbus single-aisle and widebody jetliners totaled more than 9,400, with over 5,990 aircraft delivered to customers worldwide Airbus also has expanded into the military transport aircraft sector. The A400M multi-role military airlifter - being produced under management of the Airbus Military company - will replace ageing fleets of C-130 Hercules and C-160 Transalls. In addition, aerial tankers for in-flight refueling and transport missions are available in aircraft variants derived from the A310 and A330.