United Airlines Stops All of Its U.S. and Canadian Flights

United Airlines briefly paused flights nationwide on Friday morning amid reports of a system outage.

The airline issued a ground stop on all its traffic in the United States and Canada, according to the Federal Aviation Administration’s website.

In a statement before 8 a.m., the airline said it had “experienced technical system issues” and that all systems were working normally again.

“We are aware of the issue and are working to resolve it as quickly as possible,” the company wrote on Twitter, addressing consumer complaints. “We’re sorry for the inconvenience.”

Airlines occasionally pause flights, known as a ground stop, for technical reasons. Often, the stops are temporary and service resumes quickly after, though not without causing delays and possibly even some cancellations. Sometimes, a ground stop can be part of a more lasting disruption.