Just to make sure that on your flight you can use your own headphones, we have included this audio jack converter. It works on most airplanes and will fit into the armrest in their annoying 2-slot input. Take note that you are purchasing two (2) pieces - easy to get some brownie points from whoever is sitting next to you!
You will receive 2x 3.5mm adapters. These are small, lightweight and useful. Order lots of time in advance of your journey to make sure they arrive on time!