I want to put lots of .pdf files on an iPad to take on a plane. I want to be able to delete the PDF files after reading them, and have those PDF files removed from whichever location that I initially synched them over from. I can't use dropbox because I will not have an internet connection on the plane. 1. Where should I store these PDF on the iPad? 2. What service will I use to remove them after synching? Thanks.