Ten minute hacks: Hacking airplane headphones | The Technical Blog of James
Terminal 2 3.5mm to 2x3.5mm Travel Adaptor - JB Hi-Fi
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
5x Airplane Airline Headphone Adapter for Audio Jack 2 Plug Air Plane Connector 822429602494 | eBay
Amazon.com: Dual 3.5mm Male to 3.5mm Female Airplane Headphone Adapter Gold Plated (2 Pack) : Electronics