Which document enables tracking of an aircraft's operational history?

The correct answer is flight logs, as they provide a comprehensive record of each flight an aircraft makes, detailing crucial information such as flight time, departure and arrival locations, and any irregularities experienced during those flights. This documentation helps in tracking the operational history of the aircraft, providing insight into its usage patterns, maintenance needs, and any incidents that may affect its future operations.

In contrast, maintenance logs focus specifically on the upkeep and repairs of the aircraft rather than its operational history as a whole. Aircraft registration pertains to the legal ownership of the aircraft and does not encompass operational details, while pilot licenses verify the qualifications of the pilot but do not provide any information about the aircraft's flight history. Therefore, flight logs are the most appropriate document for tracking an aircraft's operational history.