do you have the conditions/criteria that would place someone on Canada's no-fly list. As you seem to imply Mr. Khadr should be on said list, of those conditions/criteria you haven't (yet) qualified, which one(s) are you using to support your implication?
He's a terrorist, he's seen on videotape making IED's in Afghanistan to kill NATO soldiers. Maybe consider not letting people on planes who have a knowledge and history of making homemade bombs for the purposes of terrorism. I'm there's that.