According to CNN, the temporary outage lasted two hours and affected global travelers passing through several major airports, including New York's John F. Kennedy worldwide.
Some travelers arriving or departing San Diego International Airport may have been delayed New Year's Day due to a U.S. Customs and Border Protection glitch.
Sky News Australia and USA media outlets are reporting global airport systems have failed across the country on one of the busiest evenings to travel in the states.
CBP said "there is no indication the service disruption was malicious in nature".
While Customs said its systems were restored by about 10 p.m., airports warned passengers to expect delays tonight.
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It's a rough night for global travelers at Miami worldwide Airport.
"All airports are back on line after a temporary outage of #CBP's processing systems", the agency tweeted on Monday night.
The department said it was still able to screen travellers using "national security-related databases". "Your patience is appreciated". However, holidaymakers used social media to complain about severe delays.
A spokesperson tells CBS News that Customs and Border Patrol has been contacted and are investigating. "Passport system is down according to people in line", tweeted journalist Chris Stewart, along with a video of long lines.