Delta Air Lines operations are recovering from a systems outage that caused departure delays and about 170 cancellations Sunday night. Approximately 80 flights scheduled have been canceled with additional cancellations possible.

"I want to apologize to all of our customers who have been impacted by this frustrating situation," said CEO Ed Bastian. "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."

Delta's essential IT systems, which went down about 6:30 p.m. Sunday, had been restored a few hours later and all systems were back to normal shortly after midnight Monday.

Customers traveling should check their flight status at delta.com and the Fly Delta App.

A change fee waiver has been issued for customers scheduled to travel on Jan. 29 and 30, for rebooking by Feb. 3.