What describes an uncontrollable external factor affecting flight operations?

Force Majeure refers to unforeseen events or circumstances that are beyond the control of the parties involved, which can significantly impact flight operations. Examples of such uncontrollable external factors include natural disasters, significant political unrest, or pandemics. These are events that cannot be anticipated or mitigated, and they may cause delays, cancellations, or the need for alternative operational plans.

In contrast, the other options do not accurately capture the essence of uncontrollable external factors. Group typically refers to a collection of individuals for operational or administrative purposes and does not inherently denote external uncontrollable factors. Immigration Area specifically relates to customs and immigration regulations and procedures, focusing more on passengers and cargo than on uncontrollable operational influences. General Declaration is a document that pilots must provide to customs authorities upon arrival, which mainly relates to legal and regulatory compliance rather than external factors affecting flight operations.