 However, technology passed the "T-Bird" by, and by the 1980s, it was clear that the world's air forces needed a more modern training aircraft.The "Skyfox" was conceived and developed by Russell O'Quinn.The modification designs were led by T-33 designer Irvin Culver and a number of other former Lockheed employees formed Flight Concepts Incorporated in 1982, with the intent of modernizing the T-33 design.