https://www.tsa.gov/travel/special-procedures
Check with relavent airline operator
Your syringe has to be accompanied by the insulin, and the insuling has to be in quantity small enough not to break the rule for liquids, I think that is 3.4 ounces. I am not a doctor, and I am not a TSA agent. This information was obtained from a Google search.
Thanks! Your answer is awaiting moderation.