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In response to "If I have a 9hr layover (in a USA airport), I can leave the and come back to the airport, right? -- nm" by Hotkiss

certainly, you'll just have to go back through security.

Assuming you are flying in from out of the country, you're going to go through immigration and customs at your airport of entry into the US. At that point, you'll be outside of security anyway (you always are after immigrations and customs).

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