Delta, United, and American issued ground stops on Friday.United and American warned pilots that communication was intermittent.Several industries have been disrupted by an IT outage linked to CrowdStrike. Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Thanks for signing up! Access your favorite topics in a personalized feed while you're on the go. Email address By clicking “Sign Up”, you accept our Terms of Servic ...