Which description matches a Category A incident?

A Category A incident is characterized by a serious situation where a collision was narrowly avoided, indicating a significant threat to safety. This definition highlights the severity and the immediate danger that was present, despite the outcome not resulting in an actual collision. Such incidents are critical because they reveal vulnerabilities in ground operations and require thorough investigation to determine how they can be prevented in the future.

While other descriptions provided focus on less serious circumstances or factors that might disrupt operations, they do not reflect the critical nature of a Category A incident. For instance, minor mishaps and disruptions due to weather or special terminal events do not carry the same level of urgency or potential for severe consequences as a near-collision event does.