Delta Air Lines has filed a lawsuit against cybersecurity firm CrowdStrike, blaming it for a catastrophic software update that led to a global outage in July, resulting in the cancellation of 7,000 flights and affecting 1.3 million passengers. Delta alleges that the faulty update, which was deployed without adequate testing, caused more than $500 million in losses, including out-of-pocket expenses, lost profits, and reputational damage. The incident prompted an investigation by the U.S. Department of Transportation, which is also examining Delta's slower recovery compared to other airlines. CrowdStrike, while apologizing for the incident, has denied responsibility, stating that Delta's outdated IT infrastructure contributed to the prolonged disruptions. Delta claims the update exploited an unauthorized access point in Windows, a charge that CrowdStrike disputes. The lawsuit seeks damages and highlights systemic issues in the IT update practices of CrowdStrike.