Pilot Digital Twin (PDT) is a multi-model software system for creating individualized pilot digital twins. PDT integrates 3D anthropometric shape, musculoskeletal models, full-body finite element models, and physiology engines into a unified environment. Enhanced with a detailed finite element neck model, PDT simulates pilot biomechanics and injury risks during parachute openings, high-G maneuvers, and other mission-critical scenarios. PDT supports injury prevention, accommodation and fit analysis, and human-machine integration in aviation and beyond.