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The F-22 Raptor, an early successful stealth fighter, entered into service despite a protracted and costly development period.
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Lockheed Martin F-22 Raptor
American stealth air superiority fighter
The Lockheed Martin/Boeing F-22 Raptor is an American twin-engine, jet-powered, all-weather, supersonic stealth fighter aircraft. As a product of the United States Air Force's Advanced Tactical Fighter (ATF) program, the aircraft was designed as an air superiority fighter, but…Source: Wikipedia (CC BY-SA)
Stealth aircraft
Aircraft which use stealth technology to avoid detection
Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio frequency (RF) spectrum, and audio, collectively known as stealth technology. The F-117 Nighthawk was the first operational…Source: Wikipedia (CC BY-SA)