I'm flying from Los Angeles to Norway in June, and am considering buying an ibook for the trip, to maintain my sanity on the long flight. I'm wondering about powering the ibook for that long (probably about 15 hours total flying time). Obviously, one battery won't do it, and extra batteries are expensive. The sales guy at Best Buy told me most planes now supply power to each seat via a small socket that you can plug a special adapter into (available at Best Buy, of course, for $130). I've flown before but never looked for such an outlet and never used one. My question is, do all major airlines have this feature [I'm flying Continental]? I'd hate to count on it, get on the plane with no spare batteries, and then find out when it's too late that there's no power supplied to my seat.