Travelers were left scrambling Wednesday as United Airlines planes were suddenly grounded and more than 1,000 flights delayed across the U.S.
The issues sparked from what the airline said was a technical issue, but what exactly happened?
Here’s what we know:
What was the technical issue that led to the ground stop?
The impacted system, called Unimatic, houses flight information that is fed to other systems including those that calculate weight and balance and track flight times, according to United. It’s not clear what caused the problem.
“Due to a technology issue, we are holding United mainline flights at their departure airports,” the company said in a statement at the time. Safety is our top priority, and we’ll work with our customers to get them to their destinations.”
The system outage, as the company described it, lasted several hours, the statement said. It wasn’t related to recent concerns about airline industry cybersecurity.
Which flights were impacted?
According to an alert on the FAA’s website, all United Airlines flights destined for Chicago were halted at their departing airports at approximately 6:30 p.m. Wednesday.
Flights to United hubs at Denver, Newark, Houston and San Francisco airports also were affected.
As of 8:45 p.m., United flights departing from O’Hare were delayed an average of 120 minutes, according to the FAA.
Just before 9 p.m. Central time, the company said that the underlying issues had been resolved, and that they were beginning to work through the backlog of flights to get travelers moving again. A ground stop remained in effect at Chicago’s O’Hare Airport, along with airports in Newark and Denver, however.
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