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Supersonic
![A Korea-made KF-21 fighter prototype flies at supersonic speeds in a test flight Tuesday. The first KF-21 prototype reached the speed of Mach 1, or 1,224 kilometers per hour, at an altitude of 40,000 feet at 3:15 p.m. as it flew over the country's southern waters after taking off from the Air Force's 3rd Flying Training Wing in Sacheon, South Gyeongsang, according to the Defense Acquisition Program Administration (DAPA). The prototype flew for 56 minutes. [YONHAP]](https://koreajoongangdaily.joins.com/data/photo/2023/01/17/229ce774-6433-47d6-82e3-b2d9928ca1f6.jpg)
A Korea-made KF-21 fighter prototype flies at supersonic speeds in a test flight Tuesday. The first KF-21 prototype reached the speed of Mach 1, or 1,224 kilometers per hour, at an altitude of 40,000 feet at 3:15 p.m. as it flew over the country’s southern waters after taking off from the Air Force’s 3rd Flying Training Wing in Sacheon, South Gyeongsang, according to the Defense Acquisition Program Administration (DAPA). The prototype flew for 56 minutes. [YONHAP]
