Air flight shutdown

NBC News -   The FAA lifted nationwide ground stop for departing flights last night at 8:15 p.m., more than four hours after it began. More than 7,000 flights were canceled. The FAA said a router overloaded older air traffic control equipment, disrupting radar data and communications with aircraft.

Homeland Security Markwayne Mullin said authorities had found no evidence of a cyberattack.

Delta, United and American began resuming flights last night, but widespread delays and cancellations continue today as airlines worked to get planes and crews back into position....

The airline tracking service logged a total of 1,991 delays in the U.S. by 9:30 a.m. ET this morning. Another 3,749 flights have been canceled, the website said.

Unsurprisingly, it appears the majority of issues are concentrated in the nation's major travel hubs. Flight Aware's "Misery Map" ranked Hartsfield–Jackson Atlanta International Airport, Chicago's O’Hare International Airport, and New York City's John. F. Kennedy International Airport as areas with the most issues this morning.

...Expect the effects of the extraordinary nationwide ground stoppage on air travel to take time to alleviate, but Transportation Secretary Duffy said Friday night he was optimistic things will be ready for the Thanksgiving rush.

“I think we’re going to be back up and operational as we come into the heat of travel during Thanksgiving,” he said.

There’s only a week or so to go before college students and other far-flung family members fly to gather for the holiday, whic is one of the most heavily traveled periods of the year.