I was looking at the specs for the iBook and found that they had altitude requirements!?! The are 10,000ft for operating altitude and 15,000 for storage altitude. So, if im in a plane at 30,000ft, which is normal flight hight i think, does that mean it wont work right? This will in no way effect my desicion in buying an ibook next month, I just found it interesting and wondered what you guys thought.