Dedicated Flight Information Frequencies
Any particular FIR will often have one or more dedicated FIS frequencies where aircraft can make first contact for information. The quality of the information that such frequencies can give is tempered by the large geographical area that they cover, and in some more sparsely populated FIRs the frequencies are often not staffed. An FIS might suggest that aircraft contact a more suitable frequency, e.g., a local airport's radar unit, should that unit be in a position to provide a better service. These units often use the callsign suffix "Information".
In some countries, including the United States, an FIS is provided by units known as flight service stations (FSS).
Read more about this topic: Flight Information Service
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