Delta Air Lines has resumed limited departures after a computer glitch earlier saw all take-offs suspended.
Flights already in the air are operating normally, the carrier added.
“Customers should check the status of their flight before heading to the airport while the issue is being addressed,” Delta tweeted.
A power outage in the airline’s Atlanta base, which began at approximately 02:30 ET, impacted Delta computer systems and operations worldwide, resulting in delays.
Customers heading to the airport should expect delays and cancellations, Delta waned.
A statement from the carrier read: “We are aware that flight status systems, including airport screens, are incorrectly showing flights on time.
“We apologise to customers who are affected by this issue, and our teams are working to resolve the problem as quickly as possible.
Delta is one of the largest airlines in the world, serving nearly 180 million customers each year.
Delta and the Delta Connection carriers offer service to 337 destinations in 62 countries on six continents.
Headquartered in Atlanta, Delta employs nearly 80,000 employees worldwide and operates a mainline fleet of more than 800 aircraft.
A waiver has been issued for passengers due to travel before August 12th.
Passengers have been urged to check the official website for more information.
A statement added: “While inquiries are high and wait times are long, our customer service agents are doing everything they can to assist.”