Tens of thousands of people were stranded Monday after Delta Air Lines flights were grounded around the globe due to a system outage.
Delta said that systems were back online by 8:40 a.m. ET, but warned disruptions would continue amid a "limited" resumption of departures.
"Customers heading to the airport should expect delays and cancellations," Delta warned in a statement. "While inquiries are high and wait times are long, our customer service agents are doing everything they can to assist.