text:  And from the sustaining members of this NPR station. It's Morning Edition from NPR News. I'm Michelle Martin. And I'm A. Martinez. American Airlines, United and Delta have all grounded flights over a technology outage that has taken services offline around the world. Companies, banks, hospitals and emergency services have also been disrupted as there is a race to fix the issues behind it. For more, we're joined by NPR's Bobby Allen. Bobby, so what happened?