RHA's Wireless Flight Adapter makes any headphone jack wireless - The Verge
Amazon.com: Gold Plated Airplane Flight Headphone Adapters (Pack of 2) | Allows you to use your Earphones with all In-Flight Media Systems | This Airline Plane Headset Converter Enables Great Sound on
Can I convert this 3 prong jack for airplane to a 3.5mm for mobile? : r/ audio