SACHEON, South Korea - Far down the sprawling runway of the Air Force's 52nd Test Flight Group, a sleek gray aircraft emerged through the heat haze, gathering speed with an ear-splitting roar before soaring into the cloudless sky in a matter of seconds.The thunderous takeoff of the KF-21 fighter jet took place during a test flight shown to the press Wednesday in the southern city of Sacheon, some 300 kilometers south of Seoul, demonstrating the readiness and capabilities of the country's first domestically developed fighter jet program."The flight of the prototype was conducted to test the…READ FULL ARTICLE