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Tip no 2703: When winding on the first few blank exposures of a new film, check that the rewind lever is rotating (you may have to pull out the lever to check). This ensures the film is properly winding on and not mis-loaded (i.e. jumping on the film transport sprockets and/or slipped off the take-up spool).
Tip no 2704: It helps to remember to rewind the exposed film back into the cassette before opening the camera back ... oops!
I don't beleive you need to worry about x-rays affecting 400 ISO unexposed film, but there's a possibility of some minor effect on exposed stuff. Best to put the exposed ones in a clear plastic bag (if this is still allowed) and show what they are. If you have films in an x-ray-dense bag, I've heard that they can turn up the x-ray machine intensity to see what's in it!
Enjoy the trip!
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