Is the "random" selection for additional screening truly random?
I remember 10-11 years ago, I used to fly every week with Southwest Airlines out of Boston's Logan. For the first few months, I was "randomly" selected at each and every flight at boarding time. I was assuming it was because I was travelling with a French passport - I remember how popular French were at that time in the US. Then, after a couple months, I was never selected again, presumably because Southwest had built a profile on me showing that I was a "good" passenger. Is there any real substance to my (admittedly biased) assumptions?