Southwest Airlines canceled flights across the country for the second time in less than 24 hours on Tuesday, June 15, citing computer problems across the country.

Thousands of passengers took to Twitter to report what airline staff said was due to “intermittent performance issues with our network connectivity.” with a third-party weather data source. The airline also said it had “proactively canceled” roughly 500 flights due to the disruption.

At Southwest Airlines’ request, the Federal Aviation Administration announced a temporary nationwide grounding to fix a computer reservation issue. The grounding lasted roughly 45 minutes and finished at 2:30 p.m. EDT (1830 GMT), it said.

“We are aware of system issues and are working quickly to resolve. We will share more info soon,” Southwest announced on Twitter at 2 p.m. Tuesday. Southwest said in a statement that flights began again shortly before 4 p.m.

The glitch on Monday night prevented the “transmission of weather information that is required to safely operate our aircraft,” the company said in a statement to Fox Business.

According to flight tracker FlightAware, Southwest delayed nearly 1,300 flights on Tuesday or 37% of its total flights.

Southwest flyers expressed confusion on Twitter. Many said the airline informed them their flights were canceled and reported getting cut off from customer services after waiting hours on the line.

“We have a flight scheduled to leave out of GEG (flight 5530) today @ 1:05 and it is suddenly showing as canceled—is this a ‘system issue’ or is it actually canceled?” user @BabaYagaBeads replied to Southwest’s tweet.

“Define soon.” First, delayed nearly an hour before we took off, indicating an issue. And now sitting at destination on plane just waiting to get off this flight.” user @mattlarsen23 wrote.

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