Major US carriers ground flights citing communication issues

[dupe]<p>Some more discussion: <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41002195">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41002195</a><p><a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41002677">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=41002677</a>