Update: Delta's systems are back to normal, but some flights today still canceled

There was some technical issue that had Delta travelers stuck waiting Sunday night.

Delta said Monday morning that it's systems are back up and running, but some flights are still canceled.

The airline's "essential IT systems" went down around 6:30 p.m. Sunday, but everything was restored just after midnight Monday, Delta said in a statement.

The outage prompted the airline to cancel about 170 flights Sunday night, and another 80 scheduled for Monday have also been canceled. If you're flying Delta on Monday, check the status of your flight before you leave for the airport – the airline says additional cancelations are possible.

The Minneapolis-St. Paul Airport's website shows a handful of Delta flights landing at or departing from the Twin Cities airport have been canceled already.

“I want to apologize to all of our customers who have been impacted by this frustrating situation,” CEO Ed Bastian said in a statement. “This type of disruption is not acceptable to the Delta family, which prides itself on reliability and customer service. I also want to thank our employees who are working tirelessly to accommodate our customers.”

Read the original story from Sunday below.

A widespread outage grounded Delta flights across the country Sunday evening, resulting in lines so long that just looking at photos is frustrating.

Delta in a statement said its teams are working "expeditiously" to fix a system outage. It's affecting delays for flight departures – planes already in the air aren't impacted.

Meanwhile the FAA attributed it to an "automation issue," NBC News reports, and said Delta grounded its domestic flights.

The airline's Twitter timeline with replies is a constant stream of apologies about a technical issue and outage, as people tweet complaints. Like this one:

Or this one:

Here's a look at MSP:

Howie also tweeted that some passengers have bailed, and were told they could rebook.

And here are a few more tweets from around the country:

Delta is based in Atlanta, but is a huge player at Minneapolis-St. Paul International Airport. MSP is considered one of the airline’s hubs, and it’s one of the biggest airlines there.

Delta has about 80,000 employees worldwide – about 8,500 of them in Minnesota, the state’s economics department says, making them one of the largest employers.

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