RHA's Wireless Flight Adapter is my favorite new gadget (and I won't fly anywhere without it) | Laptop Mag
Amazon.com: WH-1000XM4 Airplane Headphone Adapter Replacement for Sony WH-1000XM3 WH-1000XM2 MDR-1000X EX750NA Headphone-3.5mm Golden Plated Airline Earphone Adapter for in-Flight Entertainment System(2 Pack) : Electronics
Airplane Audio Adapter 2x 3.5mm Plug to 3.5mm Jack Headphones Stereo Converter | eBay
Amazon.com: UCEC Airplane Headphone Adapter, 3.5mm Airplane Adapter for Headphones, Golden Plated Airline Headphone Adapter for in-Flight Entertainment System, 2 Pack : Electronics