United Airlines Lifts Ground Stop; Domestic Flights Resume | Update

Updated at 8:12 p.m.:

Just after 8 p.m., United Airlines said the ground stop on domestic flights has been lifted. The airline apologized for the incident via Twitter.

Original story:

United Airlines was forced to ground all domestic flights Sunday evening after a nationwide computer glitch.

The ground stop was reportedly slated to be in effect until 7 p.m. Central time.

But just after 7 p.m., the airline tweeted, "A ground stop is in place for domestic flights due to an IT issue. We’re working on a resolution. We apologize for the inconvenience."

Travelers took to social media to complain about delays and other travel issues, including a flight landing in what one passenger described as "total darkness."

Officials told NBC News that the Aircraft Communications Addressing and Reporting System, or ACARS, was having low-bandwidth issues.

The ground stop did not affect international flights or flights from Hawaii or Alaska, according to ABC 7 Chicago.

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