Which technology is most commonly used for surveillance at airports?

Closed-circuit television (CCTV) is the most commonly used technology for surveillance at airports due to its ability to monitor large areas continuously and provide real-time video footage. This technology allows security personnel to keep an eye on passenger movements, monitor for suspicious behaviors, and effectively respond to incidents as they arise. CCTV systems can be strategically placed throughout terminals, boarding areas, and perimeters to enhance overall security and safety.

While metal detectors, handheld scanners, and X-ray machines play important roles in the security infrastructure by screening for prohibited items and detecting threats, they are not primarily designed for comprehensive surveillance. Instead, they focus on specific security screening processes rather than the ongoing surveillance that CCTV provides. Thus, CCTV stands out as the foundational technology for maintaining surveillance and ensuring airport security on a broader scale.