President Donald Trump’s own policies have prompted departures of key staff and hurt morale at the aviation agency, complicating multi-billion dollar modernization plans.

Transportation Secretary Sean Duffy is set to announce plans on Thursday to overhaul and modernize air traffic control. It comes amid the latest aviation incidents at Newark Liberty Airport that's seen major delays and cancellations over the past 11 days.

U.S. Transportation Secretary Sean Duffy on Thursday will call for tens of billions of dollars to overhaul America’s strained air traffic control system to address crumbling infrastructure, dramatic staffing shortfalls and failing technology.