I'm going to London via USAir, on planes not equipped with at-seat power. It occurred to me that my laptop will not have a charge for the full flight, so no music for me, at least part of the time. I could buy a portable audio device, but I'd rather wait. Has anyone contemplated some sort of battery pack for their empeg? Something that wouldn't run afoul of air security? The empeg and a set of headphones would seem to make a reasonable device to use.