http://www.dailykos.com/storyonly/2010/6/18/876530/-American-citizen-exiled-without-due-process
It certainly would appear that FBI is using the no-fly list to exile American citizens, to banish them. Sure, you can come home, they say, just not by airplane. There are means of getting off of the no-fly lists if you are on it because of mistaken identity or a similar circumstance, but those exceptions don't cover Wehelie, or apparently the half-dozen others civil liberties groups have identified who are also in this limbo. If there is reasonable suspicion to keep these people on a no-flly list, bring them home, conduct a proper investigation and either prosecute them or take them off of the no-fly list.
It could be worse, as Adam Serwer points out. Under the Bush administration, similar circumstances ended up with Canadian citizen Maher Arar being rendered to Syria to be tortured. Not being as bad as torture, however, is not good enough for the Obama administration. Exile isn't due process.