The regulator still uses some computer systems that rely on floppy disks and other outdated hardware, according to one air traffic control union leader.

Transportation Secretary Sean Duffy on Tuesday was interviewed by CNN’s Jake Tapper and discussed disruptions at Newark airport, the air traffic controller shortage, and the infrastructure at the Federal Aviation Administration.

Newark Liberty International Airport is facing another FAA-imposed ground delay due to staffing shortages, after a telecommunications issue led to delays on Sunday.