Important Takeaways:

• Hundreds of US flights were canceled early Monday, as carriers, particularly Delta Air Lines, work to recover four days after a global tech outage caused massive delays and left travelers stranded at airports around the nation.
• More than 800 flights into, within or out of the United States were canceled by Monday morning, and more than 1,500 flights were delayed, according to flight tracking site FlightAware. Delta passengers have been slammed by nearly 4,500 cancellations since Friday, including 660 on Monday, by far the most of any airline.
• Delta declined to comment on the numbers, but in an update to customers Sunday afternoon, CEO Ed Bastian said the company is working to restore operations after the outage.
• The “largest IT outage in history” – prompted by a software update for Microsoft devices late Thursday into the early hours of Friday – brought down computers and technical systems across the world, causing disorder at airports, outages for 911 services and challenges at health care facilities.
• The outage affected an estimated 8.5 million Windows devices
• Costs from the outage could top $1 billion, Patrick Anderson, CEO of Anderson Economic Group, told CNN. But it’s unclear if – and how – any customers affected will be compensated.
• Outage caused by CrowdStrike update
  • The company said the outage was not caused by a security incident or a cyberattack, but rather a software defect.
  • The issue was identified and isolated, and engineers deployed an update to fix the problem, CrowdStrike CEO George Kurtz said.
  • Kurtz has apologized to customers and said the company is “deeply sorry for the inconvenience and disruption.”
  • In an update posted to LinkedIn late Sunday, CrowdStrike said “a significant number” of the 8.5 million devices were back online and operational.

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