Transportation Secretary Sean Duffy has made aggressive moves for the Federal Aviation Administration (FAA) to resolve the nation's critical air traffic controller shortage, but outdated equipment has long compounded problems with ensuring air travel safety.

Flight disruptions at Newark Liberty International Airport this week have illustrated the link between failures of outdated technology and a shortage of available air traffic controllers.

"Controller staffing and infrastructure progress are inextricably linked," National Air Traffic Controllers Association (NATCA) President Nick Daniels warned lawmakers during a congressional hearing in March. "A........

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