What is a key function of the ICAO's aviation security section?

The key function of the ICAO's aviation security section is to formulate security and facilitation policies. This area of responsibility is crucial as it helps create an international framework for security measures in civil aviation. By developing policies that address various security risks, the ICAO aims to promote standardized security protocols across different countries, thereby enhancing global aviation security. This policy formulation encompasses guidelines for preventing unlawful interference in aviation operations, which can include terrorism, sabotage, and other security threats.

In contrast to the other functions mentioned, managing passenger flights focuses on operational aspects rather than security policies. Establishing regulations for airport design is related to safety and infrastructure, while auditing airline safety equipment pertains more to aircraft safety compliance rather than overarching security measures. Hence, formulating security and facilitation policies is central to ICAO's mission in ensuring the safe and secure operation of international air transport.