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.

U.S. Secretary of Transportation Sean P. Duffy announced a plan to revitalize the nation’s air traffic control infrastructure Thursday. The Department of Transportation (DOT) said the purpose of the plan is to address vital safety requirements and built a “state-of-the-art air traffic control system” in a Thursday press release.