How does one know what to call an airport on the radio? Charted names seems like a good place to start, although it typically gets shortened: "Raleigh ground" is more expeditious than "raleigh-durham international ground." I've noticed that at a lot of airports people are using the names of nearby towns or cities instead of the charted name. GKT, "Gatlinburg-Pigeon Forge" gets called Sevierville, while UOS, "Franklin Co." gets called Sewanee. Is there a codified reference for airport / facility radio callsigns? Are people using these names just doing it wrong? Am I missing something?
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