DS1 loves history and mythology etc. For our recent trip to UK I decided to try out audible.com as I had a get 2 free books offer. I downloaded a mythology book for him, he LOVED it. Listened to 4 hours non stop on flight over. Didn't play games or anything else just listened. For the flight back I paid $ for a series of college lectures on famous EPIC battles (history) and he has been listening a bunch. I had no idea if he'd like it but he LOVES it. Just in case you are ever considering it. OH and FWIW he is dyslexic, very bright, loves history and watches nat geo etc.
Here are the 2 he has so far
http://www.audible.com/pd/History/Th...ook/B00IXXNABC
http://www.audible.com/pd/Classics/H...ook/B00I0ZZEIA