Airplane Headphone to 3.5mm Jack Adapters The airline adapter converts a regular headphone stereo jack 1/8" (3.5mm) to a dual prong 1/8" (3.5mm) airline jack Allow using your own 3.5mm audio jack headphone to enjoy the onbroad radio, movies...etc Fits all standard airline connectors and headphone stereo jacks Easy to use, just connect this adapter with your headphone and the audio jack in your aircraft seat