You may wonder why so many aircraft (especially older ones) have headphone sockets with two (or even three) jacks, rather than one like everything else. This does have its reasons. Mostly historical now, these include to deter theft, offer redundancy, and even to fit old seat infrastructure. This article takes a closer look at these, so you’ll never have to wonder again.
Read More Here: Why Do Airplanes Have Double Headphone Jacks? | SimpleFlying.com
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