Define "airside" in relation to airport operations.

"Airside" refers specifically to the areas of an airport that are accessible only to authorized personnel and those who have passed through security screening checkpoints. This area encompasses boarding gates, runways, taxiways, and various support facilities that are necessary for the operation of aircraft and to ensure the safety and security of passengers and airport staff while they are in transit to or from aircraft.

The correct choice accurately captures the essence of "airside" as it emphasizes the restricted nature of access. Unlike the public areas where individuals do not need to pass through security checks, the airside is meant for those who are preparing to board or have just disembarked from flights. This distinction is vital for maintaining security protocols within airport operations.

The other choices present various airport areas but fail to align with the definition of "airside." The general public areas, ticketing, and baggage claim zones are all accessible without security clearance, thus falling outside the airside category. The runway and taxiway zones alone also do not encompass the entirety of airside operations, as it overlooks passenger processing areas located beyond security screening.