3Qs: How safe are US airports?

The Trans­porta­tion Secu­rity Admin­is­tra­tion is finding more firearms than ever at air­port check­points. Is this a sign that the TSA is doing its job or an indi­ca­tion that more trav­elers are trying to board planes with these weapons in their bags? And what about “insider threats” among air­port per­sonnel? We asked an expert.