The transportation secretary announced a far-reaching plan to drastically overhaul the current technology used by thousands of controllers responsible for guiding planes in and out of airports.

The Trump administration on Thursday proposed a multibillion-dollar overhaul of a U.S. air-traffic control system that it said still relies on floppy disks and replacement parts found on eBay and has come under renewed scrutiny in the wake of recent deadly plane crashes and technical failures.