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.

Transportation Secretary Sean Duffy plans to reduce the number of flights in and out of Newark Liberty International Airport for the “next several weeks.”