What is a primary benefit of filing a flight plan for search-and-rescue purposes?

Filing a flight plan serves as a crucial tool for search-and-rescue operations. When a pilot files a flight plan, it details the intended route, altitude, and destination of the aircraft, which allows authorities to track the planned movements. In emergencies, if an aircraft fails to arrive at its destination or loses communication, search-and-rescue teams can refer to the filed flight plan to ascertain the last known position and anticipated route of the aircraft. This information significantly enhances the efficiency and effectiveness of recovery efforts, potentially saving lives.

The other choices do not reflect the primary purpose of a flight plan. While documenting passengers is important for safety, it is not the primary function of a flight plan in relation to search-and-rescue. Similarly, flight plans do not provide entertainment options or directly affect fuel efficiency; instead, they primarily exist to ensure safe navigation and assist in emergency situations.