Question: The WS-15, code name Emei, is a Chinese after burning turbofan engine, a stealth, twinjet, fifth-generation fighter aircraft developed by China's Chengdu Aerospace Corporation for what airforce?

full_context: Document 1: Sixth-generation jet fighter: A sixth-generation jet fighter is a conceptualized class of fighter aircraft design more advanced than the fifth-generation jet fighters that are currently in service in the United States and in development in other countries. The United States Air Force (USAF) and United States Navy (USN) are anticipated to field their first sixth-generation fighters in the 2025–30 time frame. The USAF is pursuing development and acquisition of a sixth-generation fighter through the F-X program to complement existing platforms in service such as the Lockheed Martin F-22 Raptor. The USN is pursuing a similar program called the Next Generation Air Dominance, likewise intended to complement and/or replace its existing aircraft such as the Boeing F/A-18E/F Super Hornet.
Document 2: HAL AMCA: The HAL Advanced Medium Combat Aircraft (AMCA) is an Indian programme of a fifth-generation fighter aircraft. It is being developed by an aerospace industry team which consists of the Aeronautical Development Agency (ADA) as the design firm with manufacturing carried out by Hindustan Aeronautics Limited (HAL) as the primary contractor and main assembly firm. It is a single-seat, twin-engine, stealth supermaneuverable all weather multirole fighter aircraft. Unofficial design work on the AMCA started in 2008 with official work started in 2011 and completed in 2014. In 2008, the Indian Navy joined the programme seeking a naval variant optimized for operation from aircraft carriers. The first flight is scheduled to occur in 2019.
Document 3: Guizhou WS-13: The WS-13 (Chinese: 涡扇-13), codename Taishan, is a turbofan engine designed and manufactured by Guizhou Aircraft Industry Corporation to power the Pakistan-China jointly developed JF-17 Thunder light-weight multi-role fighter, and in the near future the Shenyang J-31 fifth generation stealth fighter currently under development.
Document 4: CAC/PAC JF-17 Thunder: The PAC JF-17 Thunder (Urdu: جے ایف-١٧ گرج‎ ), or CAC FC-1 "Xiaolong" (), is a lightweight, single-engine, multi-role combat aircraft developed jointly by the Pakistan Aeronautical Complex (PAC) and the Chengdu Aircraft Corporation (CAC) of China. The JF-17 can be used for aerial reconnaissance, ground attack and aircraft interception. Its designation "JF-17" by Pakistan is short for "Joint Fighter-17", while the designation and name "FC-1 Xiaolong" by China means "Fighter China-1 Fierce Dragon".
Document 5: Saturn AL-41: The AL-41F is a designation for two different Russian military turbofan engine variants. The NPO Saturn AL-41F is a Russian variable-bypass ratio turbofan engine, designed for supercruise flight for the "MFI" ("Mnogofunktsionalni Frontovoy Istrebitel", "Multifunctional Frontline Fighter") program, which resulted in the Mikoyan Project 1.44. It is considered by Jane's as the Russian counterpart to the General Electric YF120 engine which lost to the more conventional fixed-bypass YF-119 in the Advanced Tactical Fighter engine program. Since the cancellation of the MFI program, the AL-41F1S and AL-41F1 designation was assigned to heavily upgraded AL-31F variants that powers the Su-35S and initial production Sukhoi Su-57 stealth aircraft.
Document 6: Lockheed Martin F-22 Raptor: The Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF). The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily as an air superiority fighter, but also has ground attack, electronic warfare, and signal intelligence capabilities. The prime contractor, Lockheed Martin, built most of the F-22's airframe and weapons systems and conducted final assembly, while Boeing provided the wings, aft fuselage, avionics integration, and training systems.
Document 7: Chengdu Aircraft Industry Group: The Chengdu Aircraft Industry Group or Chengdu Aerospace Corporation, a subsidiary of AVIC, is a Chinese aerospace conglomerate that designs and manufactures combat aircraft and is also a manufacturer of aircraft parts. It was founded in 1958 (as Chengdu State Aircraft Factory No.132 Aircraft Plant) in Chengdu, Sichuan province, China to be an aircraft supplier for the Chinese military.
Document 8: Chengdu J-20: The Chengdu J-20 () is a stealth, twinjet, fifth-generation fighter aircraft developed by China's Chengdu Aerospace Corporation for the People's Liberation Army Air Force (PLAAF). The J-20 made its maiden flight on 11 January 2011, but the plane was officially revealed on China International Aviation & Aerospace Exhibition in 2016. In March 2017, Chinese media claimed that the aircraft has entered initial operational capability phase with limited service within Air Force.
Document 9: Chengdu J-10: The Chengdu J-10 ([[Simplified Chinese characters|simplified Chinese]]: 歼-10; [[Traditional Chinese characters|traditional Chinese]]: 殲-10; [[NATO reporting name]] : Firebird) is a lightweight [[multirole combat aircraft|multirole]] [[fighter aircraft]] capable of all-weather operation, configured with a [[delta wing]] and [[Canard (aeronautics)|canard]] design, with [[fly-by-wire]] flight controls, and produced by the [[People's Republic of China]]'s [[Chengdu Aircraft Industry Group|Chengdu Aircraft Corporation (CAC)]] for the [[People's Liberation Army Air Force]] (PLAAF).
Document 10: CAIG Sky Wing: Sky Wing (Tian-Yi or Tianyi, 天翼) is a series of Chinese UAVs developed by Chengdu Aircraft Industry Group (CAIG). Three members of the Sky Wing series have been revealed by their developer, the smaller Sky Wing I or Sky Wing 1 (SW-I or SW-1) and its derivative Sky Wing 1H (SW-1H), and finally the much larger Sky Wing III or Sky Wing 3 (SW-III or SW-3). The larger Sky Wing III has been frequently, but erroreneously, referred to as Tianchi (天翅), or Xianglong (翔龙), the name of another Chinese UAV designed by Guizhou Aircraft Industry Corporation for similar functions. The cause of such confusion is that when Sky Wing was first revealed to the public at airshows and exhibitions at the proposal stage, no name was given and later only the SW designation was shown, and SW, the abbreviation of Sky Wing can either be translated as Tianchi or Tianyi, and Chinese military enthusiasts used Tianchi on their internet posts. However, Tianchi is not the Chinese name for Sky Wing III, because the developer finally revealed the name is actually Tianyi instead.
Document 11: CAIG Wing Loong: The Chengdu Pterodactyl I (), also known as Wing Loong, is a Medium-Altitude Long-Endurance (MALE) unmanned aerial vehicle (UAV), developed by the Chengdu Aircraft Industry Group in the People's Republic of China. Intended for use as a surveillance and aerial reconnaissance platform, the Pterodactyl I is capable of being fitted with air-to-surface weapons for use in an unmanned combat aerial vehicle (UCAV) role. Based on official marketing material released by CADI, the Pterodactyl can carry the BA-7 air-to-ground missile, YZ-212 laser-guided bomb, YZ-102A anti-personnel bomb and 50-kilogram LS-6 miniature guided bomb.
Document 12: J-XX: J-XX J-X, and XXJ are names applied by Western intelligence agencies to describe programs by the People's Republic of China to develop one or more fifth-generation fighter aircraft. General He Weirong, Commander of the People's Liberation Air Force (PLAAF), stated that China had several such programs underway and that an undesignated fifth-generation fighter developed jointly by Chengdu Aerospace Corporation and Shenyang Aerospace Corporation would be in service by 2018.
Document 13: Sukhoi Su-57: The Sukhoi Su-57 (Russian: Сухой Су-57 ) is the designation intended for a stealth, single-seat, twin-engine jet multirole fighter aircraft designed for air superiority and attack operations. The aircraft is the product of the PAK FA (Russian: ПАК ФА , Russian: Перспективный авиационный комплекс фронтовой авиации , "Perspektivny Aviatsionny Kompleks Frontovoy Aviatsii", literally "Prospective Airborne Complex of Frontline Aviation"), a fifth-generation fighter programme of the Russian Air Force. Sukhoi's internal name for the aircraft is T-50. The Su-57 will be the first aircraft in Russian military service to use stealth technology. The fighter is planned to have supercruise, stealth, supermaneuverability and advanced avionics to overcome the prior generation fighter aircraft as well as ground and maritime defences.
Document 14: Yakovlev Yak-130: The Yakovlev Yak-130 (NATO reporting name: Mitten) is a subsonic two-seat advanced trainer aircraft originally developed by Yakovlev and Aermacchi. It has also been marketed as a potential light attack aircraft. Development of the plane began in 1991 and the maiden flight was conducted on 25 April 1996. In 2002, it won a Russian government tender for training aircraft and in 2009 the aircraft entered service with the Russian Air Force. As an advanced training aircraft, the Yak-130 is able to replicate the characteristics of several 4+ generation fighters as well as the fifth-generation Sukhoi Su-57. It can also perform light-attack and reconnaissance duties, carrying a combat load of 3,000 kg.
Document 15: Xian WS-15: The WS-15 (), codename Emei, is a Chinese afterburning turbofan engine designed by the Shenyang Aeroengine Research Institute and manufactured by the Xi'an Aero-Engine Corporation, used to power China's Chengdu J-20 fighter, which would be able to achieve supercruise.
ground_truth: People's Liberation Army Air Force