Need to verify the current availability. Let me think—ICAO Doc 9811 is called "Security of Air Transport and Airport Operations and Security of Ground Handling and Airside Security". Correct? Or maybe a different title. I should confirm that.
Doc 9811 bridges the gap between flight operations and security safeguarding. Annex 6 focuses on the technical aspects of aircraft operation—such as flight planning, equipment, and crew duties—but these operational elements often overlap with security requirements. Doc 9811 provides the "how-to" for operators to ensure that their daily flight activities comply with anti-interference standards, such as cockpit door security and the management of unruly passengers. icao doc 9811 pdf link