It is insane that being put on the no-fly list is at the whim of the government and nearly challenge proof.
"The No Fly List is currently the subject of a number of different lawsuits against the U.S. governement, primarily for preventing travel by those who claim no affiliation or knowledge of terrorist groups other than what they have heard in the news. Many of these individuals are reporters, business people, teachers, or others who travel frequently to predominantly Muslim countries and/or practice Islam themselves. As a result, many have asserted that the No Fly List is fueled by bigotry, not legitimate intelligence regarding terrorist ties. However, these lawsuits are often stymied by the
U.S. government's privilege against disclosing classified information that could harm national security. This makes it difficult for those prosecuting these claims to investigate the reason behind their inclusion on the List or to challenge the List on constitutional grounds because they cannot easily show a pattern of improper behavior."
http://www.hg.org/article.asp?id=31742