What is the purpose of a NOTAM?

A NOTAM, or Notice to Airmen, serves a crucial role in aviation by informing airmen about hazards, changes in airport procedures, or navigational aids that may affect their flight operations. This includes information about temporary obstacles, runway closures, airspace restrictions, and other essential data that ensures the safety and efficiency of flight operations.

While the other options touch on important aspects of aviation, they do not encompass the full scope of what a NOTAM specifically covers. For instance, notifying airports of runway closures is part of NOTAMs, but the primary purpose is broader, alerting airmen directly about various critical changes and hazards that they may encounter during their flights. Hence, the emphasis on hazards and changes emphasizes the safety regulations in place for safe navigation and flight operations.