For what type of aircraft are ATC services not provided?

ATC services are not provided for any model aircraft and Unmanned Aircraft Systems (UAS) operating at or below 400 feet. This is primarily due to the regulations surrounding low-altitude operations, which typically fall under the jurisdiction of the pilot or remote pilot in command rather than Air Traffic Control. At these altitudes, aircraft generally do not interact with the controlled airspace managed by ATC, allowing for a less congested environment and enabling the use of these craft for recreational purposes, surveying, or other activities without the need for active ATC oversight.

In contrast, commercial jetliners, private helicopters, and military aircraft all operate in airspace that requires ATC services, especially at higher altitudes where air traffic is much denser. These operations necessitate coordination with ATC to maintain safety, efficiency, and compliance with aviation regulations. Therefore, the reason for indicating that ATC services are not provided to certain lower-flying unmanned aircraft and models is rooted in their operational framework and the separation of airspace management responsibilities.