The other loophole is that lighters are not banned on overseas originating flights. In fact, most overseas airports sell lighters in their souvenir shops, as I know from my Cheap Lighters of the World Collection.
TSA Bans Lighters From Flights
Airline passengers will no longer be allowed to bring cigarette lighters on board commercial airplanes beginning April 14, ending a security loophole that lawmakers said could be exploited by terrorists seeking to light explosives in the cabin.
But the Transportation Security Administration acknowledged yesterday that another loophole remains: Passengers may (still) bring up to four books of matches aboard an aircraft.
Some of these things just defy logic. My high-end cigar lighter, a Corona, has a wood exterior finish and probably wouldn't set off most metal detectors.