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

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 ...

If you already own several pairs of headphones, then that also means multiple cables with different terminations or jack plugs on the ... whether that be the dual two-pin connector used on ...