My recommendation would be to separate your audio/video player and mobile phone/wi-fi device. Apple products just don't have the battery life for a all in one device (like the iPhone, iPad, iPod touch) IF you are going to be using the audio/video sections for extensive periods of time like 13 hour plane rides. I would recommend something from Cowon like the s9 or d2 (or whatever) that offer extensive battery life like 50-60 hours for music 10-20 for video. Get a phone of your choice and you are set for the even the most demanding portable audio/video use (and by your original post that seems to be the case)
