There was a Tom Clancy novel whereby the captain of a JL flight at YVR murdered his co-pilot, then flew out over the Atlantic, before reverting and, after declaring an emergency, did a kamakazi crash into the US Capitol during a Joint Sitting with POTUS already there, really good stuff, reading wise.

FWIW, I think that EVERYONE (including flight crew) in the sterile area should be screened, NO guns should be allowed on an aircraft (even those escorting prisoners under custody), EVERYBODY (including screeners, cabin crew, flight crew, concession staff, McDonalds staff) should have to go through security. AND I mean, EVERYBODY, just like here in Australia.

Dave