if you say the word "BOMB" within a city block of an airport, refuse to comply (for any reason) with the directives of an air marshal, and reach into you backpack... *pop**pop**pop* end of story.
sorry for the family, but tough shit. if he was that unstable and unpredictable he shouldn't have been anywhere near public transportation. hell, if it'd been philly, wolf might of popped him.