Transport chief blames US-wide flight disruptions on upgrade of old copper wiring

Weary travellers braced for more flight disruptions on Saturday as service resumed from US airports after an hours-long stoppage that the Trump administration blamed on faulty equipment or an error by a contractor tasked with switching out old copper wire communication lines.

Friday’s nationwide ground stop sparked widespread chaos and left hundreds of thousands of passengers in limbo, with some pulled off planes moments before departure by airline staff who appeared in the dark about unfolding...