I have been on the No Fly Watch List for a year. I will never be told the official reason. No one ever is. You cannot sue to get the information. Nothing I have done has moved me any closer to getting off the list... According to a European government, the list they have been given to work from [this year] has since grown to 80,000.
My friends tell me it is just more government incompetence. A tech buddy said there's no one in government smart enough to write a search algorithm that will find actual terrorists, so they end up with authors of books criticizing the Bush White House. I have no idea what's going on.