The Brief

United Airlines has grounded their mainline flights at their departure locations due to a "technology issue," according to a statement from the company.

Nationwide ground stop issued

What we know:

A ground stop has been issued for United Airlines flights at multiple airports across the United States, according to the Federal Aviation Administration website.

What they're saying:

"We expect additional flight delays this evening as we work through this issue," United's statement said. "Safety is our top priority, and we’ll work with our customers to get them to their destinations."

The ground stop is expected to end at 9 p.m. ET (6 p.m. PT), according to the FAA's National Airspace System Status website.

What we don't know:

United did not give a specific cause of the "tech

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