Operations are returning to normal after a runway equipment issues prompted ground stops at Newark Liberty and Hartsfield-Jackson Atlanta International airports Sunday, the Federal Aviation Administration announced.

Caught in the middle of the issues at Newark is United Airlines, which is the most active airline at the New Jersey airport. While the problems lie with the FAA system, the airline is where people often aim their frustrations over cancellations and delays.

Transportation Secretary Sean Duffy tells "CBS Mornings" it will take months to restore normal operations at Newark Liberty International Airport.

Several times over the last year, Newark controllers lost radar or radio service, leaving them unable to talk with planes they were tracking.