Delays, cancellations mount at President Donald J. Trump International Airport amid nationwide ground stop

A nationwide ground stop issued Friday after air traffic control communications problems disrupted flights across the United States, including at President Donald J. Trump International Airport in South Florida. The FAA said it was investigating the issue, while departure boards showed multiple delays and cancellations. Homeland Security Secretary Markwayne Mullin said officials had no indication that a malicious act or hacking caused the communications failure.