>I have to add that I don't think any of my films were ever destroyed by an airport scanner.

That is a bit of a myth these days. Modern airport hand luggage scanners are safe up to ISO 800 or so. And from my experience airport staff is very willing to hand-check high ISO film (did an intercontinental trip with T-Max 3200 once and had no issue getting it hand-checked in 4 different countries - it probably helped that I separated out only the 3200 film and got all others scanned regularly)

I hear there's new CT machines which may cause issues, but apparently the staff is well aware of this and they should be labeled.