1. All airport radio station operators were once addressed as "Such-and-Such Radio." The name and responsibilities of the guy or gal with the microphone changed, but the call sign stayed the same.

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2. It is a Flight Service Station, but you address it as "radio." Call it nostalgia. I have flown with a pilot who said "Vancouver Flight Service, this is ..." and they still answered him.

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3. A UNICOM is just someone at the field with a microphone, maybe the fueler, or the dispatcher at a flying school, not a professional flight services specialist.

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4. You have to say who you are talking to.