T-38 Talon

The Northrop T-38 Talon is a two-seat, twinjet supersonic jet trainer. It was the world's first, and the most produced, supersonic trainer. The T-38 remains in service as of 2023 in several air forces. The United States Air Force operates the most T-38s. In addition to training USAF pilots, the T-38 is used by NASA.