Another great video of the US Air Force F-22 Raptor some may call it the worst nightmare of the Russian air force. The Lockheed Martin F-22 Raptor is a .br The Lockheed Martin F-22 Raptor is a single-seat, twin-engine, all weather stealth tactical fighter developed for the United States Air Force (USAF). Developed .br The Chengdu J-20 (Jian-20; simplified Chinese: 歼-二 十; traditional Chinese: 殲-二十; pinyin: Jiān èr shí) is a fifth-generation, stealth, twin-engine fighter aircraft .