In aviation terminology, a "Merlin aircraft" can refer to several subjects, most notably the historic Fairchild Swearingen Metroliner / Merlin series of turboprop business and commuter aircraft, or military helicopters powered by Rolls-Royce Merlin engines. In modern technological contexts, it also describes any fixed-wing aircraft retrofitted with Merlin Inc.'s autonomous flight hardware and AI pilot system for uncrewed or reduced-crew operations.