~Thanks to all. I like the idea of putting the zapper in the checked-in luggage instead of the carry-on. I think I will put it in a clear plastic zip-lock bag with some printed information on what the zapper is for. Hopefully that will answer any of their questions. (yes, it is a vacation - Costa Rica - Last time we were there, my son got sick and I am hoping to avoid that this time if possible). Thanks again~