How useful. That'll really, I mean REALLY show 'em who's boss, as they shut the airport down and strand thousands of hapless travelers who I am sure will really understand your idiotic point. Which is ... ? Shit, all it takes is for you to put on some sneakers, run rapidly past the security checkpoint(s), perhaps open an alarmed door on your way out to the tarmac. Do it at a hub, shut down everything. Doesn't take anything as stupidly exotic as powdered explosive in your pantyhose, idiot.
Walk into an airport in baggy pants with powdered expolosives in a leg bag >which can slowly be dispersed as you walk (perhaps controlled by some sort of >string control like POWs scattered excavated soil in "The Great Escape"). >After walking around in the lobby it should soon be tracked to the security >checkpoints and interfere with any current swab or automated detection methods.