Anyone know what the third hole in airline headphone jacks are for? It's smaller than the other two in use. : r/whatisthisthing
Use iPhone Earphones with 3-Conductor Stereo Devices
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Convert Airplane Noise Cancelling Headphones to Stereo Headphones : 6 Steps (with Pictures) - Instructables
Plug your iPhone Earphone into a Standard 3-Conductor Jack
Aircraft/Airplane Headphone Adaptors - YouTube
Can I convert this 3 prong jack for airplane to a 3.5mm for mobile? : r/audio
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