I don't have the faintest idea and I have no idea how they happen on TSA pre-check when they do it. However, to ME, personally, the concept of paying extra and getting PSA pre-check, which I think is what Jet Blue does, among others, is ludicruous. Just because someone pays money, why should they be granted less security screening? To me, it would seem that if a terrorist could stand a better chance of getting a bomb on a plane by paying $10 or $20, I would think they would do that.... I agree with the concept of the trusted traveler program, but paying money without more, to get out of security screenings is crazy..