Staying within the US: no customs process — this checker applies when re-entering the US from abroad.
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No — this checker covers duty-free limits when re-entering the US from abroad. A trip that starts and ends within the US has no customs process at all.
There's no customs exemption to worry about — duty-free limits only apply when bringing goods into the US from another country.
This checker covers duty-free limits when a US traveler re-enters the US from abroad — since your trip stays within the US, there's no customs process to check.
Yes — a valid REAL ID-compliant driver's license or passport is required at the TSA checkpoint for any US domestic flight.