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Don't Worry About a Passport if You're Traveling Domestically

While the US is a pretty massive place, and sometimes it's hard to imagine that it's just one country, you probably might forget that it is still domestic travel. And as such, you don't always have to have a passport with you. While you should bring along an ID of some sort, just to make things easier, don't stress too much, as the TSA employees can also help you get through with just a few personal questions for verification.

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Just remember that this is only relevant if you are traveling domestically. If you're going international, then you will still need a proper and valid passport.