If flying into an airport without a functioning control tower, what must the pilot do regarding the flight plan?

When flying into an airport without a functioning control tower, the pilot must close the flight plan through a Flight Service Station (FSS) or an Air Traffic Control (ATC) facility. This requirement exists to ensure that flight plans are properly accounted for and that search and rescue operations can be initiated if necessary. Closing the flight plan confirms to the authorities that the pilot has completed their flight safely and does not require further assistance.

This process is especially crucial at uncontrolled airports where there is no tower to monitor arrivals and departures. By properly closing the flight plan, the pilot helps prevent unnecessary search efforts for an aircraft that has already landed safely. This practice aligns with aviation safety protocols to maintain effective communication and tracking of aircraft, regardless of the operating environment.