I am going on a trip where I'll be on a plane for at least 6 hours. I intend to use my PowerBook 1.67 15" on the plane. I only give the specs because I know batteries vary. I would probably watch a movie. Should I run it from the hard drive or my ipod? I would also probably surf the web with my phone tethered as a modem...if this is even possible on a plane. Honestly it's been 15 years since I've flown. Do planes have plugs? Seems as though it'd be a nice feature. The bottom line is that when I land I'll have 3 days of classes that are 8 hours long. I'm not sure how accessible a plug will be. It's a University Campus so I'd venture to guess they're used to having laptops around. But still. Should I spring for another battery or is that a lame idea. I can only count two other times that I'll need it. One trip to England and another trip to NY.