 I'm Deborah Rodriguez. United and American flights are getting off the ground again. Other airlines, including Delta, still stranded by a massive global IT outage. It's also affecting banks, broadcasters, healthcare and 911 systems. BBC tech editor Zoe Kleinman. CrowdStrike, which basically does antivirus protection, issued an update which has had a bad effect on PCs and devices running Microsoft software, which of course is lots of them.