What is the maximum number of aircraft allowed in a formation?

The maximum number of aircraft allowed in a formation is four. This limitation is established to ensure safe and effective management of the formation flight, incorporating factors such as visibility, communication, and coordination. The four-aircraft configuration allows for optimal spacing and maneuverability while minimizing the risk of collisions or miscommunication between pilots. This number facilitates effective leadership and control within the formation, where each aircraft can maintain a clear position relative to others and respond efficiently to any changes in flight dynamics or flight maneuvers. When the formation exceeds this number, it can complicate the communication and visual contact necessary for safe operations, leading to increased risks during maneuvers.