I carry 5x7 film that is cut and reboxed. About half of the time, what I hear is "if we cannot see it, we have to X-ray it" (which makes senses from a security point of view). With that in mind, you could carry your Velvia in quickloads. What concerns them also is that the boxes are retapped. With factory-tapped boxes, it should be easier.
So far, I did not notice problems from X-ray exposures going through major airports.
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