sky marshal

A sky marshal is an undercover law enforcement or counterterrorism personnel on board a commercial aircraft to counter aircraft hijackings. Such personnel are also known as air marshals, a flight marshals, and aviation safety officers or an in-flight security officer. Sky marshals may be provided by airlines such as El Al (who provide sky marshals on every flight), or by government agencies such as the Austrian Einsatzkommando Cobra, Royal Canadian Mounted Police, China Air Marshal Command, German Federal Police, National Security Guard in India, Metropolitan Police MO19 (Specialist Firearms Command) from London, Pakistan Airports Security Force, or US Federal Air Marshal Service.