Airport threats in 2026 fall into three primary categories: physical security, cybersecurity, and biological/health safety. Physical threats include the traditional risks of terrorism, prohibited items (weapons or explosives), and the rising issue of "unruly passengers" who disrupt operations and endanger crew members. Cybersecurity threats have become a major concern as airports transition to "smart" infrastructure; hackers can target everything from air traffic control systems to passenger biometric databases and digital boarding pass servers. This is why airports now invest heavily in "Zero Trust" networks and AI-driven threat detection. Biological threats involve the rapid spread of infectious diseases across borders, leading to the implementation of non-intrusive thermal scanners and improved ventilation systems in terminals. Additionally, "Insider Threats"—staff or contractors with security clearance who may be compromised—remain a high priority for intelligence agencies. To counter these, airports use a "Layered Defense" strategy that includes background checks, 3D CT luggage scanners, behavioral detection officers, and sophisticated K-9 units, all working together to ensure that the "sterile" side of the terminal remains a secure environment for global travel.