The Airbus A380 is a double-deck, wide-body, four-engine jet airliner. It is the world's largest passenger airliner; many airports have upgraded their facilities to accommodate it because of its size. Initially named Airbus A3XX, Airbus designed the aircraft to challenge Boeing's monopoly in the large-aircraft market; the A380 made its first flight on 27 April 2005 and began commercial service in October 2007 with Singapore Airlines.