The outage on Monday night affected airports including New York's JFK, San Francisco and Denver, as worldwide travellers arrived from holiday travels on New Year's Day, reports CNN.
"No one has been getting past JFK Airport immigration for the last hour".
It's a rough night for worldwide travelers at Miami global Airport.
One person tweeted that Miami Airport is "total chaos" while another said the lengthy lines at JFK "are horrible".
Worldwide travelers returning to the USA on New Year's Day faced massive frustration nationwide as the computer systems operated by Customs and Border Protection failed.
CBP said travelers at "some ports of entry experienced longer than usual wait times". CBP later put out a statement on its Twitter page, saying all the airports were back online after a brief outage of its processing systems.
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According to the CBS News, there were up to 2,000 passengers stuck in lines at the Miami International Airport.
Customs says that passengers continued to be processed during the outage, "using alternative procedures at affected airports".
Making the situation worse is that Monday was a busy day, with a lot of people returning home from the holiday.
Security remained the priority during the outage.
"At this time, there is no indication the service disruption was malicious in nature", the agency said.
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