We have never had problems traveling with our flowtoys. If you are taking them carry-on, you might want to make them look as harmless as possible. If you are checking in, we recommend putting in a nice note stating that they are performance props and to handle with care. If you are made to leave the prop behind, we recommend disassembling your props, and taking out the light units and caps (flowlights or capsules), as most of the cost is in these parts.
If you have any questions, please feel free to contact us!