What information is primarily included in a NOTAM?

A NOTAM, or Notice to Airmen, is primarily designed to convey critical information that could impact flight operations concerning airport facilities, procedures, and hazards. This may include important details like runway closures, airspace restrictions, or changes to navigational aids.

The focus of a NOTAM is to ensure that pilots and operational personnel are made aware of any significant changes that could affect safety or operations during flight, which is why the inclusion of significant changes affecting flight operations is the correct answer.

The other options do not align with the primary purpose of a NOTAM. For example, airport terminal updates or changes in flight schedules are typically communicated through other channels, such as airline announcements or airport websites, rather than NOTAMs. Similarly, while weather conditions are crucial for flight planning, they are generally provided through aviation weather services and not included in NOTAMs unless there are specific weather-related alerts or hazards that directly affect a flight operation.