Delta reported a system outage that grounded the entire airline on Monday, stranding tens of thousands of travelers worldwide.
A power outage at the airline's Atlanta headquarters caused the global computer failure, NBC News reported. The outage affected everything from the airline's check-in systems to its smartphone app.
The outage began at 2:38 a.m. ET, leaving passengers from Las Vegas to Rome waiting for updates.
About six hours later, the company announced that the worldwide ground stop had been lifted and some flight departures were resuming, the Minneapolis Star Tribune reported.
The airline tweeted updates Monday morning.
In a public statement, Delta cautioned travelers to expect ongoing delays and cancellations.
The company offered waivers for all of its flights, announcing online, "If your flight is canceled or significantly delayed, you are entitled to a refund. Even if your flight is not canceled, you may make a one-time change to your ticket without fee."
The world's second-largest airline, Delta typically operates 15,000 daily flights, carrying an average of 550,000 daily passengers during the summer, CNN reported.
"It's very crippling because it's a ripple effect. A glitch in the morning like this where you have to delay all your flights, this will last for days because remember airlines have moved to the point were they have very little excess capacity," CNN Aviation Analyst Mary Schiavo said.
Many Twitter users commented on the outage.
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