Bill
That is another problem. I will have many connecting flights and anticipate some non co-operative security types who will not lower themselves to hand inspect film. If you take film with you you just have to take a chance with the other alternative being buying film at your destination, which eliminates half the risks. Normal security xray machines, that are operating properly, at departure areas will not harm 400 speed or lower film. That is for one pass with a machine that is in spec. The hazard increases with each new scan. You pay your money and you take your chances. I do not think that there is any guaranteed way to remove this risk altogether. This is one of the areas that digital may be better in.
Bob