Which aircraft are responsible for making position reports in a stream formation?

In a stream formation, the responsibility for making position reports typically falls to the first and last aircraft. This is because the first aircraft can communicate the starting point and status of the formation for efficient coordination and navigation, while the last aircraft ensures that the entire formation is accounted for and can relay information about the trailing end. This system helps maintain situational awareness and enables effective communication within the formation, ensuring that all members are on the same page regarding their positions and any potential changes in the formation's flight plan. This is crucial for maintaining safety and order during operations, especially when flying in close proximity to one another.

While it might seem logical for all aircraft to make position reports, this could lead to unnecessary chatter and confusion over the communications network. The middle aircraft may not have an overview of the entire formation's dynamics and situation, and having no specific aircraft report would leave gaps in communication. Thus, assigning responsibility to the first and last aircraft optimizes the reporting process and maintains clear and effective communication within the formation.