Airtravel with cars...
I know all about this and for sure it is a pain in the XXX. When we fly to races, I usually UPS or similar everything that has had anything to do with nitro i.e. cars, tools oils, starterbox etc. to my hotel, and only bring with me exactly what I know will not test positive for explosives (Tx if you clean it up really good, new tires, spareparts in bags etc. Fure sure it has become a big pain to travel with RC cars and it constantly makes me wish for a standardised set uf rules. But in general, don't expect to be allowed to board with anything that has been in contact with fuel...