Except that you can't run a Bluetooth device while in flight. Oops. And the only other way to use the MP3 player on the phone is in speakerphone mode which would be just a wee bit annoying to the other passengers.
So I'm thinking about buying an MP3 player that suitable for airplane use. I don't need fancy DRM, as I just intend to use it with files that I rip myself from CDs I already own.
What's a good choice?