This airline adapter converts a dual-prong airline jack to a standard headphone stereo plug (3.5 mm, 1/8 inch). Plug the headphones cord into the adapter and insert it into the airline jacks to ...

Once upon a time, when headphone jacks were far more common, planes typically had dual audio outputs. You can still find them ...

Modern planes typically offer Bluetooth and noise-canceling headsets, so needing a special adapter ... kept the double-jack design because it had already been built into the aircraft.