David,
What is really scary is they have only found some of the people on those flights. And when I was flying a lot, the airlines were pretty good at really not being sure just who was on a flight as they always over booked. And all it takes is for one person on one of those flights to have gotten it from that idiot and God only knows how many more that person may come into contact with before they finally manage to track him or her down. If nothing else he should be locked away for life for knowingly putting peoples lives at risk and not caring.
Ron
