Remember when airline headphones were just plastic tubes similar to a stethoscope? : r/nostalgia
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Why is it that when you plug airplane headsets into the provided seat socket, only one of the earpieces works and not both together? It can't be coincidence or bad luck, as
In-flight entertainment - Wikipedia
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aviation history - What was the inflight entertainment in the early seventies? - Aviation Stack Exchange
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Pneumatic tube room at the Broadway department store.
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In-Flight Entertainment Has Come a Long Way
MRI-Safe Stethoscope-Style Pneumatic Headphone
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