The only reason I ask is because I could never hear any music or movie above the noise of the plane. So what I did was build a headphone amplifier, it can be fit into a package around the size of an ipod and it really solved the problem. The first one I built cost me the same amount as one sold at radio shack ($20.00) and it out performed it ten fold. If you'd like to find one try ebay and do a search for "cmoy". That will pull up several headphone amplifiers. I also bought noise canceling headphones but I went back to my regular ones with the amp and it sounded better.
Hope this helps. You can PM me if you need help finding one