U.S Transportation Secretary Sean Duffy will urge Congress on Thursday to approve billions of dollars to replace aging radar, telecommunications equipment, towers and other facilities in an overhaul of the crumbling air traffic control system,

Amid safety concerns from a spate of plane crashes and near misses, President Donald Trump says a planned massive overhaul of the U.S. air traffic control system will revolutionize the air industry.

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.