>The battery that goes in an AirTag is the same as in a lot of wristwatches and I expect it would look like a wristwatch via x-ray.
If it's just scare tactics then the similarity to watches is irrelevant. However, if for whatever reason they want to crack down on it, it being similar to wristwatches isn't going to stop them. I suspect most wristwatches are kept with the person rather than in checked luggage, and that if were actually determined they could demand a search of your luggage if they spot anything that remotely looks like an airtag on x-ray.
If it's just scare tactics then the similarity to watches is irrelevant. However, if for whatever reason they want to crack down on it, it being similar to wristwatches isn't going to stop them. I suspect most wristwatches are kept with the person rather than in checked luggage, and that if were actually determined they could demand a search of your luggage if they spot anything that remotely looks like an airtag on x-ray.