Your choice regarding the scanners, if you go through the scanners of course your wig would be visible. I never go through those scanners at the airports whether I wear the wig or not. I make them pat me down. These scanners were sold to the government by an ex-Bush Jr. "Homeland Security" boss, Chertoff. The pilots' union (in the U.S. at least) lobbied to allow their pilots NOT to have to be scanned by them. Good example of why unions are nice to have. They are banned in Europe.

"http://www.digitaltrends.com/international/airport-x-ray-body-scanners-banned-in-europe-over-cancer-risks/"

Your choice.