How do I know if my trip requires an additional permit?

How do I know if my trip requires an additional permit?

One of the best tools to use when you're travelling internationally is the website at the State Department: www.state.gov. Also what you can do, is you can also check with your airline. Your airline will have the most up to date information with respect to entry requirements. So if you're in doubt, call your airline, let them know where you're travelling, and ask them what type of documentation and what type of visas are required for that country.