Which situation requires a specific arrangement for operation in formation?

The situation that necessitates a specific arrangement for operation in formation is closely tied to safety and communication needs that arise when transporting passengers. When conducting formation flights with passengers, it is imperative to have a clear and structured formation to ensure that all aircraft can communicate effectively and maintain their positions relative to one another. This structured arrangement serves not only to promote the safety and comfort of passengers but also ensures adherence to established flight protocols that facilitate coordination and responsiveness in the event of an emergency.

While formation flying during bad weather conditions, without passenger fees, or in high-density airspace also requires careful planning and consideration, these scenarios generally pertain to operational challenges related to visibility, air traffic, or regulatory compliance rather than the specific passenger considerations that arise in transporting individuals. The need for a structured, precise arrangement is most critical when the safety and well-being of passengers are at stake, which underscores the importance of the correct answer in this context.