A Delta Airlines jet takes off from LaGuardia Airport in...

A Delta Airlines jet takes off from LaGuardia Airport in New York Saturday. Widespread delays and cancellations continue nationwide Sunday. Credit: Neil Miller

Airport traffic across the country was continuing to recover Sunday morning after communication failures caused a nationwide ground stop of all flights for four hours on Friday, resulting in widespread delays and cancellations Saturday.

Nationwide, more than 9,000 flights were delayed as of Sunday at 7 a.m. and 1,635 were canceled, according to FlightAware. That left tens of thousands of people stranded in airports across the country.

On Sunday morning at John F. Kennedy Airport, 61 outbound flights were canceled and 17 were delayed; 58 incoming flights were canceled and 28 delayed; 

At LaGuardia, 34 outbound flights were canceled and 21 delayed; 37 incoming flights were canceled and 27 delayed.

At MacArthur, two flights were delayed and four canceled in all.

Workers with FAA contractor L3 Harris Technologies were replacing copper wire with fiber-optic cable on Friday, a routine upgrade that somehow went wrong, U.S. Transportation Secretary Sean Duffy said at a news conference Saturday. 

Delays continued into Saturday in part because of difficulties reorganizing flight crews. Duffy said he expected flight traffic to return to normal by Sunday evening.

Check back for updates to this developing story.

In such a car-dependent place, agents’ road tactics have brought new risk to the daily routines of many Latino drivers. NewsdayTV’s Ken Buffa and Newsday investigative reporter Josefa Velásquez have more on this story. Credit: Newsday Staff

'At any moment something could happen' In such a car-dependent place, agents' road tactics have brought new risk to the daily routines of many Latino drivers. NewsdayTV's Ken Buffa and Newsday investigative reporter Josefa Velásquez have more on this story.

In such a car-dependent place, agents’ road tactics have brought new risk to the daily routines of many Latino drivers. NewsdayTV’s Ken Buffa and Newsday investigative reporter Josefa Velásquez have more on this story. Credit: Newsday Staff

'At any moment something could happen' In such a car-dependent place, agents' road tactics have brought new risk to the daily routines of many Latino drivers. NewsdayTV's Ken Buffa and Newsday investigative reporter Josefa Velásquez have more on this story.

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