I have the Sennheiser noise canceling headphones mentioned in this message and I love them. I have used them on planes, buses and my exercise bike. They do make whatever you are listening to on the Book Port much easier to hear. I can still hear what is going on around me and do not feel isolated at all while using them. They use two AAA batteries and I have not had to change them yet. I got them for Christmas. I don't know how many hours I have used them but I ride my exercise bike 40 minutes four or five times a week. If you fly a lot I would seriously consider noise canceling headphones of some brand because I can say they definitely make a positive difference in an environment with low frequency noise like an airplane. Joni ----- Original Message ----- Subject: [bookport] Re: Planes and the Bookport. Sennheiser PXC250 have previously been mentioned on this list for traveling. They are noise-canceling headphones, and use AAA batteries to counter some of the background hum from engines, and presumably let one hear better at lower volumes. They run about $125 new at Amazon and about $80 reconditioned at MacMall (I believe). I haven't yet used them on a plane, but I like their sound and comfort at home. The new ones I purchased came with a nice case that slips through one's belt, and would nicely hold the Bookport securely, but I haven't yet tried it to see if it would hold both the Bookport and the headphones together.