Well, any good shortwave radio receiver with SSB/USB can tune the HF aviation frequencies of worldwide communications. I think if I was an aviation enthusiast I would be more attracted by oceanic position reports from an airplane over the Atlantic ocean, than listening to 121.9 ground frequencies of local airports...
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I know that the law of many countries makes aviation communications "a state secret" but VHF aviation frequency receivers are for sale... just about everywhere. Try to figure that one.
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Over and out -
Happy contrails