One of the AirTags actually flew around internationally for a week or so (London, Amsterdam, back to the US a few times!) but sadly after about a week there were no more updates.
Someone must have found the AirTag in whatever baggage container it was stuck in and removed the battery.
I still have the AirTag in FindMy, one day I suppose I'll delete it but I sometimes wonder what happened to it.
Did the person who found it just throw it out? Do recovered AirTags go back to Apple to be recycled and resold? Does the CEO of American Airlines, Robert Isom, have a scrooge-mc-duck-esque pool of lost AirPods he swims around in? Sometimes I wonder.