There are some airlines that allow you to use your headphones with the standard 3.5mm jack, but very few.
Most will require an adaptor which splits the 3.5mm into two in order to hear the sound in both ears - a quick google image search found the image below - and these can be bought much more cheaply than a pair of earphones. You can probably get one at the airport but it will be more expensive than sorting it out before hand.
Have a nice trip!
Mark