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. Addressing security concerns, the US Customs and Borders Protection said that there was no indication that the service disruption was malicious in nature.
As of Monday at 9:30 p.m. airport operations returned to normal with fewer delays.
The department said it was still able to screen travellers using "national security-related databases". All airports were back on line after wait times for travelers that were longer than usual, it said.
Several airports, including JFK International and the Dallas Fort Worth International acknowledged the delays on Twitter. The New Year's Day disruption is oddly similar to one that occurred last year on January 2 - also the first Monday of the year.
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People posted photos of long lines at John F. Kennedy International Airport in New York City and Hartsfield-Jackson Atlanta International Airport in Georgia. "Happy New Year!" said Jessica Yang, a program manager at Microsoft, in a Twitter post.
One person tweeted that Miami Airport is "total chaos" while another said the lengthy lines at JFK "are horrible". A similar computer outage occurred a year ago.
A passenger jet takes off from San Diego International Airport.