Major delays were reported at a number of airports Monday, from Phoenix to New Orleans and from Atlanta to NY and Chicago, according to Flightradar24.
The airline anticipates scattered delays and said that travelers should check its website for the latest updates on specific flights.
The Federal Aviation Administration said Monday's problem is tied to a flight planning program called Aerodata.
By about 7:45 a.m. the system was back online, he said.
Passengers stand in line waiting to board a flight to Las Vegas at John F. Kennedy International Airport on the day before the Thanksgiving holiday, November 21, 2018, in the borough of Queens, New York.
At least five major airlines experienced major computer outages early Monday (April 1), causing massive travel headaches around the country.
The U.S. government says several airlines are experiencing delays after being affected by computer glitches.
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US airlines like Southwest, Delta and JetBlue were forced to cancel or delay hundreds of flights on Monday because of an issue with Aerodata, a system used to monitor a plane's weight and balance, according to the Washington Post.
Technical issues have impacted several carriers Monday morning.
United said 150 flights by its United Express regional carriers were delayed.
American Airlines identified the culprit as AeroData "experiencing a technical issue that's impacting multiple carriers".
Alaska, United and JetBlue Airways were also experiencing disruptions due to issues with the Aerodata system.
Kate Modolo of Delta said that the outage prevented some of its Delta Connection flights from leaving on time. The other four affected airlines had more than 175 flights delayed.
Customers barraged Twitter with their complaints over confusion at airports and delayed flights.