What is NOT a responsibility of a Flight Services Station (FSS)?

A Flight Services Station (FSS) primarily serves as a source of information and assistance to pilots, especially regarding flight planning and weather updates. One of its key roles includes providing pre-flight services by offering weather briefings, route information, and flight plan filing assistance. Additionally, FSS can facilitate post-flight information, which involves providing pilots with information about landing rights, aviation weather updates, and other necessary post-flight operations.

Relaying ATC clearances is also part of the services an FSS provides, as they may help communicate important information from Air Traffic Control (ATC) to pilots, ensuring that the necessary clearances are understood and acted upon.

However, the responsibility of providing separation between aircraft is specifically the purview of Air Traffic Control. FSS does not have the authority or capability to separate aircraft in flight; this task is handled by ATC to ensure safety and efficient air traffic management. Hence, the option that describes a responsibility that does not fall within the functions of an FSS is accurately identified.