http://www.detroitnews.com/story/business/2018/09/25/delta-halts-flights-nationwide-technology-issue/37941195/

Delta Air Lines Inc. said it has restored its systems, allowing U.S. flights to resume after an hour-long technology issue forced the carrier to ground domestic flights across the nation.

"Delta teams have restored all IT systems after a technology issue briefly affected some of our systems this evening," the airline said in a statement Tuesday. "All groundstops have been lifted."