For nearly 11 hours, a major power outage brought the world’s largest airport to a complete standstill. Atlanta’s Hartsfield-Jackson International ground to a halt, stranding thousands and canceling more than 1,000 flights.

Started by a fire in a Georgia Power underground electrical facility, the fire damaged the building’s redundancy system that should have picked up the slack. There’s no sign the fire was caused deliberately, but the exact cause for the fire remains unknown. Already exhausted travelers were frustrated even more by the airport staff’s lack of communication.

Some passengers were stuck on the tarmac for over seven hours. Many argue that in future crises, a more robust chain of command for the building will help frustrated passengers find food, water, and reassurance. For now, the busiest time of year for travel is back on track.

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