By Garth Calitz The North American X-15A-2 represents one of the most striking chapters in the history of hypersonic flight. It was a radical, purpose-designed modification of an already groundbreaking rocket plane, testing the limits of materials, aerodynamics and pilot endurance. Unlike a sleek airshow performer, the X-15A-2 functioned as a rugged flying laboratory. It was stripped down, elongated, and reinforced to address one primary question: how does a piloted vehicle p