I feel badly for our friends in the UK and EU. I hope there can be a positive resolution (no pun intended) for the new film destroying CT scanners. I'm not sure how popular instax is with travellers and tourists compared to "traditional" 135, 120, or large format film, but now that Fuji has put out a warning, perhaps that will help the cause.
Here in the US, I flew from San Jose to Denver yesterday for the long weekend. SJC doesn't have the new CT scanners yet, and normally I would have just sent everything through the X-ray machine, but I just wanted to see how amenable TSA employees would be to a request for hand check. I requested hand check for the 5 rolls of 35mm film I was carrying (in a Japan Camera Hunter film case), and had no issues. It was a mix of home bulk-rolled cassettes, and some factory loaded HP5+. I don't think the Denver airport has the new CT scanners either, but I'll report back on my return leg.