There are different kinds of services. If a control tower and an FSS are located on the same airport, the function that is provided by the FSS is Airport advisory service.
What services does FSS provide?
Flight Service Stations is often called FSS for short. They help to provide different kinds of services such as pilot briefings, weather observations, pilot reports, flight plan processing and others.
Airport advisory services are often given at airports without the use of an operating control tower. Local airport advisory (LAA) is described as a kind of service given by facilities that are found on the landing airport.
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