Airlines typically have a dual prong jack and your headphones have a single plug, connecting a single headphone plug will result in mono sound in only one ear!
This airline adapter will help you to get stereo sound.
Airlines allow you to bring your own headphones and use them
with the in-flight entertainment system to enjoy movies and music
on-board, but don't forget this adapter! otherwise you will not be able
to enjoy it.
This airline adapter converts a regular headphone stereo jack
1/8' (3.5mm) to a dual prong 1/8' (3.5mm) airline jack.
Allow using your own 3.5mm audio jack headphone to enjoy the
onbroad radio, movies...etc.
Easy to use, just connect this adapter with your headphone
and the audio jack in your aircraft seat.
Fits all standard airline connectors and headphone stereo
jacks.
It will allow using your own headphones with the in-flight
entertainment system.