Bose Single 1/8" Stereo Female to Single/Dual 1/8" Mono 40399
2.5mm to 3.5mm Headphones Cable/Airline Adapter For Bose-QuietComfort25 QC25 | eBay
Amazon.com: Tranesca Replacement Airplane Headphone Adapter Compatible with Bose Quiet Comfort QC15 QC25 QC35 QC45 and More Headphones, Golden Plated 3.5mm Jack : Electronics