Delta Air Lines says its IT systems have been restored and flights are no longer grounded due to the technology problem.
Earlier the company issued a groundstop as its IT teams worked to address a technology issue impacting some of its systems.
Delta is telling those passengers the issue is with the airline's computer system but did not elaborate.
Delta mentioned there "there was no disruption or safety impact on any Delta flights in the air". Booking, check-in and flight status are now available on delta.com.
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"We apologize for the difficulties you have experienced", Delta said in a tweet. "We appreciate your continued patience".
It wasn't immediately clear how many flights were affected during what would have been a typically slower time of the evening for departures.
Delta made an apology to its customers for the inconvenience.