Live updates: Major U.S. air carriers ground flights as mass IT outage hits Windows users

Several major U.S. airlines — including American Airlines, United and Delta — grounded flights early Friday due to a technical issue impacting IT systems, as mass outages disrupted airports, banks, broadcasters and businesses around the world. Some 911 call centers, as well as IT services of the Paris Olympics, were also affected. Microsoft said it was aware of an issue affecting Windows programs running cybersecurity technology from CrowdStrike. “The issue has been identified, isolated and a fix has been deployed,” CrowdStrike’s CEO said early Friday, as some services appeared to be resuming and American Airlines said it was able to “safely re-establish” operations.