Which duty involves monitoring for security threats during flights?

The duty that involves monitoring for security threats during flights is primarily the responsibility of a Federal Air Marshal. These trained law enforcement professionals are assigned to flights specifically to ensure the safety and security of passengers and crew members. They operate undercover, making them unobtrusive while they observe passenger behavior and remain vigilant for any signs of potential threats, such as suspicious actions or items.

Federal Air Marshals are equipped to respond swiftly to any incidents that may occur during the flight, including the potential for terrorism or disruptive behavior. Their presence is part of a broader strategy to deter unlawful acts and provide immediate response capabilities.

In contrast, while flight attendants are responsible for the safety and comfort of passengers, their role does not specifically involve the direct monitoring of security threats; rather, they are trained to handle emergencies and ensure adherence to safety protocols. Law enforcement officers are generally responsible for security outside of the flight context and at airports, while aircraft mechanics focus on the maintenance and repair of the aircraft, which does not involve monitoring passenger behavior once the flight is in the air.