hmmm i would call the airline. if not, you can have the tool set UPS-ed to wherever it is that the car is being sold from. i can help you out with that. belive it or not, a lot of people ship luggage when they go on vacation through UPS. if you do take it on the airline, i would pack it in a cardboard box (again, i can help u out with that) or a suitcaser and just check it as a piece of luggage. i know that professional chefs travel with thier own knife sets all the time, so i dont see where a tool set woulod be an issue?