I will be flying out to sunny Orlando(hopefully) in just over a week but the thought of 9 hours in a cramped seat is niggling me. So to relieve the boredom I was thinking of buying a PSP, could play a game, listen to music etc., but then wondered if you are allowed to use a PSP on and plane and if so how long does the battery last ? Hope all you well travelled peeps can let me know. Thanks. p.s. Is a PSP the best choice ?