Flights from Atlanta to some cities had been halted unti 11:30 p.m. Exacerbating the issue, Delta said not all the delays and cancellations were reflected through reservations agents, on the Delta website, app or on airport information screens.
According to the Federal Aviation Administration's web page on airport conditions earlier in the evening, flights from Atlanta destined for Minneapolis-St. Paul International, and New York's LaGuardia Airport were not be allowed to depart until at or after 11:30 p.m.
Some arriving flights were delayed, which also affected departing flights, according to the FAA.
During the outage, Delta in a statement said "teams are expeditiously working to fix a systems outage that has resulted in departure delays and cancellations for flights on the ground. Flights in the air remain unaffected.
"Some customers are experiencing delays upon landing, particularly at Delta's hub airports," according to the airport. "Delta apologizes to customers for the inconvenience."
Delta's largest hub is in Atlanta.
Delta flights delayed due to computer outage