What must be filed for flights that proceed 25 NM or more from the point of origin if a flight plan is not filed?

For flights that are conducted 25 nautical miles or more from the point of origin in the absence of a filed flight plan, a flight itinerary must be prepared. This requirement is rooted in the need for safety and accountability, as the flight itinerary provides important information about the flight, including departure and arrival points, duration, and the route expected to be flown.

A flight itinerary helps authorities and support personnel track the flight if necessary and increases the chances of a timely response should an emergency arise. It serves as a means of ensuring that someone is aware of the aircraft's whereabouts, which is crucial for safety in the airspace system.

Other terms, like flight map, flight schedule, and flight log, do not fulfill the same purpose as the flight itinerary for this particular requirement. A flight map may assist in navigation, but it does not provide the necessary flight information to authorities or those concerned about flight status. A flight schedule generally relates to commercial operations and does not apply to general aviation in the same context. A flight log records flight information post-flight, which is not useful for pre-flight communication and safety.