Er, you can get on the "No-Fly" list for almost any reason. Multiple investigations and examples have shown that the No-Fly list does not just include people who are a threat. The very fact that the list is kept secret and the mechanisms by which people are selected is secret, and there is no real methodology in place for CHALLENGING your place on the list? Makes the list an UTTERLY unacceptable measurement for pretty much anything. Including who should or should not be able to fly.