The Boeing 747-8 is a wide-body airliner formerly developed by Boeing Commercial Airplanes, and the largest variant of the 747. After introducing the 747-400, Boeing considered larger 747 versions as alternatives to the proposed double-deck Airbus A3XX, later developed as the A380. The stretched 747 Advanced was launched as the on November 14, 2005, for a market forecast of 300 aircraft. The first 747-8F Freighter performed its maiden flight on February 8, 2010, and the passenger 747-8I Intercontinental followed suit on March 20, 2011. The cargo version was first delivered in October 2011 and the airliner began commercial service in June 2012. Its fuselage is stretched by to , making it the longest airliner until the 777X, which first flew in 2020. While keeping its basic structure and sweep, the wing is thicker and deeper, holding more fuel, and wider with raked wingtips. Powered more efficiently than preceding 747s by a smaller version of the General Electric GEnx turbofan from the 787 Dreamliner, its maximum take-off weight (MTOW) grew to , the heaviest Boeing airliner. The Freighter version has a shorter upper deck and can haul over . The Intercontinental version can carry 467 passengers in a typical three-class configuration over . A total of 155 aircraft were built including 107 freighters and 48 passenger airliners. The final aircraft, a 747-8F produced as line #1574 (1,574th 747 built), was delivered to Atlas Air on January 31, 2023. Development Background Boeing had considered larger-capacity versions of the 747 several times during the 1990s and 2000s (Boeing New Large Airplane). The 747-500X and -600X, announced at the 1996 Farnborough Airshow, would have stretched the 747, but they did not attract enough interest to enter development. Also at Farnborough in 1996, a hypothetical wider-bodied 747-700X was described by a Boeing spokesperson as being possible, but inconsistent with the future requirements identified by the company. In 2000, Boeing offered the 747X and 747X Stretch derivatives as alternatives to the Airbus A3XX. This was a more modest proposal than the previous −500X and −600X. The 747X would increase the 747's wingspan to by adding a segment at the root. The 747X was to carry 430 passengers up to . The 747X Stretch would be extended to long, allowing it to carry 500 passengers up to . However, the 747X family was unable to attract enough interest to enter production. Some of the ideas developed for