Faulty equipment in an “incredibly old” telecommunication system may have caused an air traffic control issue, U.S. Transportation Secretary Sean Duffy says. In a press briefing on Saturday, he said a contractor was doing routine maintenance to upgrade copper wire to fibre optic cable when something went wrong. Officials are now investigating whether the error was due to “incompetence” or a “faulty router,” he added. Bryan Bedford, administrator of the U.S. Federal Aviation Administration added that U.S. air travel should be back to normal by the end of Sunday. This is just the second nationwide ground stop in the United States since the Sept. 11, 2001, attacks. Follow along for key updates:
