The regulator still uses some computer systems that rely on floppy disks and other outdated hardware, according to one air traffic control union leader.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 warned on Sunday that he's "concerned" about the whole airspace of the United States, citing old equipment being used by the Federal Aviation Administration.

The FAA has been buying parts for its outdated systems on eBay, Transportation Secretary Sean Duffy has revealed as he admits that the chaos seen at Newark airport will 'happen in other places'