Answer: Bus, train, car: No constraint. For electronic models, remember to turn off the vest when you take this type of transport with your vest. Plane : You may encounter some difficulties with the security services regarding the CO2 cartridges used to inflate the airbag. According to the regulations (IATA Regulations - see Manuals section), you are authorised to fly with 2 gas cartridges (the volume must be less than 200cc), in the cabin or in the hold. Even if the regulations allow it, it is possible that the security service or the airline refuses to let you board with it. We strongly recommend that you print the "IATA Regulations" and show this document to the security service or the airline during the control if they ask for more explanations. In any case, it is the airport security service and the airline that will make the final decision whether or not to accept the airbag on board. Often each airline will have their own advice pages online, it is worth printing these out also as supplementary documentation.