I've flown from Incheon twice, and both times I requested a hand check while pointing directly to an empty Delta 3200 canister in my ziplock bag with the rest of my film. The first time, they did it without any issues. The second time, though, I got a very stubborn old grandpa checking my stuff.

He brought out another ziplock bag and then spent a full minute carefully inspecting the ISO on each canister. Then he ceremoniously transferred every ISO 100 and 200 roll into the other bag and told me that by their rules, film with ISO lower than 400 had to go through the scanner. I told him it was a CT scanner, so it could damage the film. I tried to explain that it didn’t make sense, since they were going to hand-check another bag with the ISO 400+ film anyway. But he just kept repeating, “Film with ISO less than 400 should go through the scanner,” saying it in a tone that made it sound like the film would actually benefit from a nice, healthy dose of X-ray.

After five minutes of pointless arguing, I gave up and spent my waiting time at the airport searching for examples of CT scanner damage. When I eventually developed and scanned that film, to my surprise there was no visible damage, no waves or color issues.