The Airbus A380 is the first double-floor commercial jet.The aircraft is powered by either four Rolls-Royce Trent 900 engines or by four Engine Alliance GP7000 turbofan engines.If the seats were laid out in the three class layout suggested by Airbus then you would have 10 first, 76 business, and 439 economy class seats (with a total of 525 seats all together).20% of the A380's airframe is made of composites.
The A380's upper deck extends along the entire length of the fuselage, with a width equivalent to a wide-body aircraft. This gives the A380-800's cabin 550 square metres (5,920 sq ft) of usable floor space, 40% more than the next largest airliner, the Boeing 747-8, and provides seating for 525 people in a typical three-class configuration or up to 853 people in an all-economy class configuration. The A380-800 has a design range of 8,500 nautical miles (15,700 km), serving the second and fourth longest non-stop scheduled flights in the world (as of November 2017), and a cruising speed of Mach 0.85 (about 560 mph or 490 kt at cruising altitude).