Wow! I just learned about this. Hopefully you'll find this useful if you fly a lot and can make use of it.
"Global Entry is a U.S. Customs and Border Protection (CBP) program that allows expedited clearance for pre-approved, low-risk travelers upon arrival in the United States. Though intended for frequent international travelers, there is no minimum number of trips necessary to qualify for the program. Participants may enter the United States by using automated kiosks located at select airports.
At airports, program participants proceed to Global Entry kiosks, present their machine-readable passport or U.S. permanent resident card, place their fingertips on the scanner for fingerprint verification, and make a customs declaration. The kiosk issues the traveler a transaction receipt and directs the traveler to baggage claim and the exit."
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