The Airbus A380 is a double-deck, wide-body, four-engine jet manufactured by Airbus Industrie, the European consortium. It is the world's largest commercial passenger aircraft and the upper deck extends along the entire length of the fuselage. It is also the greenest, with the lowest cost per seat and the lowest emissions per passenger of any large aircraft. Despite having almost 50% more floor space and 60% more headroom than the Boeing 747-400, it is 50% quieter on take off.