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?
Sentence (from "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).
Relevant evidence: Yes