This site has been replaced by http://www.alpa.org/dal/Committees/PBS/PBSHelp.
I may eventually pull this page down completely, but I wanted to leave it up for a little bit to let you find the new source of PBS information.
You may find some of my calculators on the PBS Committee site above or perhaps linked to in the info page of PBS. Both Delta and ALPA are welcome to do this. However, I also have these posted at https://www.johnfbell.com.