If you are arriving at an airport after hours with no tower open, which facility should you contact for advisories?

When arriving at an airport after hours, the appropriate facility to contact for advisories is the Flight Service Station (FSS). Flight Service Stations provide crucial services, including flight planning assistance, weather briefings, and advisories for pilots, especially in situations where air traffic control services are not available, such as after tower hours.

The FSS can provide information on runway conditions, NOTAMs (Notices to Airmen), and other relevant details that a pilot would need for a safe landing and operations at a non-towered airport. Since the control tower and ground control tower are not operational during these hours, and contacting an ARTCC (Air Route Traffic Control Center) would not be suitable for local airport advisories on the ground, the FSS is the most appropriate choice to ensure safety and obtain up-to-date information before arriving at the airport.