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I've flown several times with slot cars AND controllers, which to the ignorant might look like some form of triggering device (last year I even went to Italy by way of Switzerland). I took them in with my clothes checked through in a roll on suitcase and once in carry-on luggage. I've never been questioned... With a case like yours it should present no problem since it can be easily opened and if necessary the cars can be inspected. I wouldn't kick up a fuss if they do look... it's educational for them and you might promote the hobby. I would be more concerned with customs.
Greenman62
Greenman62