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
10pcs Airplane Airline Headphone Adapter Audio Jack 2Plug Air Plane Connector 822429574074 | eBay
iLuv I113BK Airplane Flight Headphones Adapter
10 Pack Airplane Headphone Adapter Dual 3.5mm to AUX Airline Stereo Converter | eBay
Bose® QuietComfort® headphones airline adapter
RHA's Wireless Flight Adapter makes any headphone jack wireless - The Verge