The invention pertains to the field of security for aircraft and other vehicles, and more particularly to systems for preventing the hijacking, commandeering or suicide bombing of aircraft, or other vehicle(s). Aircraft system and vehicle system embodiments of the invention have one or more kinds of automating computers capable of safely controlling either an aircraft or vehicle in one or more types of common, well-proven, or yet-to-be-developed, computer-automated modes. The system provides mechanical control linkage disabling means interfaced with control signal receiving means responsive to wireless, or hard-wired, transmitted security-related control signal(s). Control linkage disabling means are located within a series of physical control linkage components of a vehicle at a point subsequent to where manual control input is initiated and prior to where computer automated control is provided. The disabling means renders ineffectual the mechanical control needed for one or more humans to control or direct a vehicle.