The government will not disclose who is on its list or why someone might have been placed on it.

After the 2009 attempted "Christmas Day" bombing – an attack stopped by alert, courageous passengers, not by a bloated, ineffective no-fly list –

The government lowered the standard for putting people on the list then scoured its files for anyone who qualified. . . .Among the most significant new standards is that now a person doesn't have to be considered only a threat to aviation to be placed on the no-fly list. People who are considered a broader threat to domestic or international security or who attended a terror training camp also are included, said a U.S. counterterrorism official who spoke on condition of anonymity to discuss sensitive security matters.