Airline Airplane Adapter for Headphones Headset Stereo Plug 3.5mm 1/8", Travel Mate,Random Plug Color--Golden or Silver Use the airline adapter to connect your own headphones to the in-flight entertainment system on the airplane for listening to music and movies Most of the headphones (portable, noise cancelling) are equipped with the 1/8" plug that will fit this adapter The airline adapters converts a standard headphone stereo mini plug (1/8", 3.5mm) to a dual-prong airline jack This adapter is designed with a smaller rounded "base" to fit with all 2-prong airline jack. (Some adapters don't and will not fit everywhere)