Sean Duffy said the number of flight cutbacks would fluctuate by time of day with most targeting afternoon hours when international arrivals make the airport busier.

Experts weigh in on what travelers can do if facing delays or cancellations, and how to be proactive for upcoming flights.

The mounting air traffic control problems at Newark Liberty International Airport caused aviation officials to implement a ground stop for flights on Sunday morning, the third such incident in the past two weeks.