During the outage, footage from airports showed gates full, with planes waiting on taxiways and passengers thronging concourses, desperate for information. (EPA Images pic)NEW YORK: US air travel was expected to return to normal on Sunday after a nationwide ground stop left hundreds of thousands of passengers in limbo and disrupted travel worldwide.

The Trump administration blamed Friday's ground stop – meaning no planes can take off – on a botched replacement of old copper wire communication lines.

Federal Aviation Administration (FAA) chief Bryan Bedford said that 12,000 flights were canceled on Friday, while tracking website FlightAware showed more than 6,600 canceled flights on Saturday.

As of Sunday morning, FlightAware had recorded more than 1,200 cancelled flights.