Investigators from the NTSB arrived at Newark Liberty International Airport on Monday after a near catastrophe over the weekend.
The brief outage happened at 3:55 a.m.
The facility where controllers work the airspace around Newark airport is located in Philadelphia and was already short air traffic controllers.
Theresa Claiborne had her final flight with United Airlines on Thursday.
A United flight from London to Newark diverted to Bangor on Friday after the crew reported a passenger disturbance.
Chicago Midway was recently ranked as the worst airport for flight delays, by FlightAware after a summer travel season full of mishaps across the nation.
