<p>“The idea is that a non-suicide bomber should not be able to reliably leave a checked bag in a plane that s/he is not on. So if you miss your connection, they would have to remove your checked baggage, although this is probably not normally a big issue, since most missed connections are due to flight delays of the earlier segment that would also cause the baggage to miss the connections.”</p>
<p>Right. So if you failed to board the last leg and you had luggage on the flight, then it could raise a red flag because they’d know there was unaccompanied luggage on that last leg. But duh, if you’re deliberately trying to ditch, you don’t check your luggage in the first place! So no alert is ever “triggered.” You guys are making this more complicated than it needs to be. Use carryons and ditch the last leg if you’re so inclined.</p>