Thousands of flights still canceled as officials blamed ageing air control system for nationwide grounding

The Trump administration says Friday’s four-hour nationwide Federal Aviation Administration (FAA) ground stop that delayed or canceled thousands of flight stemmed from routine maintenance.

At a news briefing on Saturday, the US transportation secretary, Sean Duffy, said that the issues began when a contractor was performing “routine maintenance” at a remote FAA facility to “switch telecommunications lines” from copper wire to fiber optic cable.