FRANKFURT, Germany — A faulty software update caused technological havoc worldwide Friday, grounding flights, knocking down some financial companies and news outlets, and disrupting hospitals, small businesses and government offices.
The breadth of the outages highlighted the fragility of a digitized world dependent on just a few providers for key computing services.
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The trouble was sparked by an update issued by cybersecurity firm CrowdStrike and affected its customers running Microsoft Windows, the world’s most popular operating system for personal computers. It was not the result of hacking or a cyberattack, according to CrowdStrike, which apologized and said a fix was on the way.
Businesses and governments worldwide experienced hours-long disruptions — their computer monitors glowing blue with error messages — and they scrambled to deal with the fallout. CrowdStrike’s chief executive said some of its systems will require time-consuming manual fixes.
Thousands of flights were canceled and tens of thousands were delayed, leading to long lines at airports in the U.S., Europe, Asia and Latin America. Airlines lost access to check-in and booking services in the heart of the summer travel season. By afternoon, the worst appeared to be over, though there were still lingering cancellations and delays because of the cascading effect of the disruption.
Several local TV stations in the U.S. were prevented from airing the news early Friday, and some state and local governments reported problems at courts, motor vehicles departments, unemployment agencies, emergency call centers and other offices, but as the day progressed many of the systems were getting back to normal.
Affected hospitals had problems with appointment systems, forcing them to suspend patient visits and cancel some surgeries.
Alison Baulos said her 73-year-old father’s heart surgery in Paducah, Ky., was canceled Friday morning because of the tech outage, leaving her family scared and worried.
“It does really make you just realize how much we rely on technology and how scary it is,” Baulos said in an interview. She said her father was waiting at Baptist Hospital to find out what will happen next. A phone message left with the hospital was not immediately returned.
American Express said it temporarily had some difficulties processing transactions, while TD Bank responded to online complaints by saying it was working to restore customers’ ability to access their accounts.
In New York City’s Times Square, right before 12:30 a.m., the blue “recovery” screens popping up on laptops appeared on several giant electronic billboards. A few were dark Friday afternoon.




















