Toronto airports to gradually resume U.S. flights after FAA lifts hours-long ground stop Toronto StarChaos continues for passengers stranded after U.S. airspace closed for hours CBCFAA ground stop latest updates: Thousands more flights canceled Saturday; officials blame overloaded routers; no sign of cyberattack YahooDisruptions Persist as Air Travel Recovers from Nationwide Ground Stop: Live Updates The New York TimesThousands of flights canceled as airlines work to dig out from nationwide ground stop AP News