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.
When can you see the 'wolf moon' in New Orleans?
NASA described last month's supermoon, Monday's and the one coming at the end of the month as a sort of trilogy of supermoons. From two supermoons, a meteor shower to a lunar eclipse, here's a list of astronomical events for the first month of 2018.
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.
- All 50 states agree to use AT&T first responder network
- Wind Chills Drop Below Zero Again
- Terrorists storm CRPF camp in J&K's Pulwama, jawan killed
- Dozens Killed in Bombing at Shiite Center and News Agency in Kabul
- Special Weather Statement, Wind Chill Advisory issued for Ohio Co
- Oyintiloye Urges Youths to Learn Persistence — George Weah's Victory
- Pence's Aspen neighbors hang 'Make America Gay Again' sign
- New Year's Eve 2018: Where To Watch Celebration Coverage
- Father: Army Soldier Died Trying To Save People From Bronx Fire
- North Korea vows to bolster its nuclear capability