Headphone uses two prong plug. No way to plug in your own one prong plug headphones with out an adapter. - Picture of United Airlines - Tripadvisor
Airline Headphone Adapter 3 Prong To 1 Pin China Manufacturers & Suppliers & Factory
Any ideas on how to make this work? The airline headphones in this picture have 2 prongs and I thought using a “L and R” 3.5mm splitter would do the trick, but
Can I convert this 3 prong jack for airplane to a 3.5mm for mobile? : r/audio
10pcs 3.5mm Jack Audio Adapter Airline Airplane Travel Traveling Earphone Headphone Headset Jack Adapter - Earphone Accessories - AliExpress