Not just that...if you are on the plane, you don't have connectivity or if you do it's the dog slow variety. I know from my iPad and iPhone, both 64GB models being full all the time, if I were to get a different device I would definitely be looking for one with expandable storage. This is especially true in a 10" tablet. Some of my 1080P concert videos are 15+GB because I don't bother to reencode for portable devices (I just use the same files as I do for my HTPC).
16-32GB definitely wouldn't cut it for a long haul flight from LAX to NRT.