Here are some of the books I have found that are available through Amazon.com:
Full disclosure: I haven't bought any of them, in E-form or any other, for me or for Himself. But, I am thinking that one or more of these will be good choices for airport or plane reading because:
* there is always the possibility of learning something useful or developing a profitable hobby;
* and you never know when or where you will detect the potential of a soon-to-be-discovered fashion trend.