Which statement is true regarding formation flights?

Formation flights refer to multiple aircraft flying in a coordinated manner while maintaining a specific arrangement relative to one another. The statement identifying that authorization from the pilot-in-command of each aircraft is necessary is accurate because any formation flight requires a mutual agreement and coordination among all participating pilots to ensure safety and adherence to regulations. This is essential for managing separation distances, communication, and the overall operational integrity of the flight.

In formation flying, clear communication and coordination are vital to mitigate risks associated with potential turbulence created by the leading aircraft, and to maintain controlled speed and altitude across the formation. Each pilot must understand and comply with the agreed-upon maneuvers, which further underscores the necessity of authorization from each pilot-in-command involved.

Regarding the other statements, formation flights with passengers for hire are subject to specific regulations and are not universally permitted. Additionally, while formation flights are often permitted, they are not devoid of restrictions and must follow aviation safety protocols. Conducting formations is not simply a matter of how many aircraft can join, but rather it requires careful planning and mutual consent, which is not always applicable in every scenario.