Transportation Secretary Sean Duffy warned on Sunday that he's "concerned" about the whole airspace of the United States, citing old equipment being used by the Federal Aviation Administration.

Transportation Secretary Sean Duffy unveiled a sweeping plan to replace decades-old infrastructure to boost safety, cut delays, and support future air travel in a move to modernize the United States’s air traffic control system.

In an exclusive interview with Meet the Press, Transportation Secretary Sean Duffy says he’s concerned about the whole of U.S. airspace after recent outages at Newark Liberty International Airport.

NBC’s Kristen Welker grilled Sean Duffy on the repeated air traffic control outages at Newark Liberty Airport and the transportation secretary didn’t seem convinced that his agency has a handle on the ongoing crisis.

Transportation Secretary Sean Duffy plans to reduce the number of flights in and out of the Newark Liberty International Airport for the “next several weeks,” as New Jersey's largest airport struggles with radar outages and numerous flight delays and cancellations due to a shortage of air traffic controllers.

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