Final answer:
In aviation regulations, a flight plan should be closed no more than 1 hour after ETA, and a flight itinerary should be closed no more than 24 hours after ETA if no SAR time is filed.
Step-by-step explanation:
The question pertains to aviation regulations about closing a flight plan and flight itinerary, specifically the time frame to do so after the Estimated Time of Arrival (ETA). According to standard procedures, a flight plan should be closed not more than 1 hour after the reported ETA. In contrast, if there is no filed Search and Rescue (SAR) time, the flight itinerary should be closed not more than 24 hours after ETA. Thus, the correct answer is B) 1 hour, 24 hours. It is important for pilots and air traffic services to adhere to these regulations to maintain safety and efficiency in air travel operations.