Which group of individuals represents a Level 4 Threat?

A Level 4 Threat typically refers to a situation where individuals may pose a serious risk due to their mental state or behavior that could lead to violent actions or severe disruptions. Therefore, mentally disturbed individuals can be categorized as a Level 4 Threat because their unpredictable actions, driven by severe psychological issues, may endanger themselves or others on the aircraft.

In contrast, unruly passengers are often disruptive but do not necessarily indicate a severe threat; their behaviors can usually be managed or de-escalated without posing significant danger. Passengers with minor grievances typically express dissatisfaction but do not present a risk to safety; their issues can often be addressed through communication and customer service. Civilian bystanders do not fall within the context of passengers on the aircraft and typically do not pose a threat in this specific scenario.

Thus, identifying mentally disturbed individuals as a Level 4 Threat aligns with safety protocols, recognizing the need for heightened awareness and appropriate intervention in situations where psychological instability could lead to violence or chaos.