The problems that disrupted flights at New Jersey’s largest airport this spring could be repeated anywhere across the country, so Transportation Secretary Sean Duffy is trying to sell Congress on his plan to overhaul the nation’s air traffic control system that will cost “tens of billions.

Operations at Newark, one of the main airports serving New York City, have improved significantly after the federal government imposed flight cuts following a series of major disruptions, U.S. Transportation Secretary Sean Duffy said on Wednesday.