What does "informed observer" mean in airport security?

The term "informed observer" in the context of airport security refers specifically to individuals who are trained to recognize unusual behavior or situations that could pose a threat to safety and security. These observers are equipped with the skills necessary to identify signs of suspicious activity, enabling them to respond appropriately and alert authorities when necessary. Their training allows them to distinguish between normal and abnormal behavior, making them an essential part of the security landscape at airports.

While the other choices highlight roles or responsibilities within the airport environment, they do not specifically capture the proactive and vigilant nature of an informed observer. Monitoring flight schedules and managing baggage relate to operational functions, while being aware of security procedures pertains more to passenger compliance than the active observation role described by the informed observer concept.