The same orgonite forums have had posts from people who claim that they were able to travel by air with orgonite on their person and in their luggage, seemingly in neither case having been noticed by "security" procedures.
2Tuff has also remarked somewhere here on CureZone of a similar air-travel experience.
There have been a few theories bandied about as to how/why metal detectors may not sense orgonite, but nothing conclusive enought that I feel able to try explaining as I otherwise do not understand the principals in play. Among the potential explanations, I don't know that all metal detectors are created equally.