Share to Facebook Share to Twitter Share to Linkedin On Friday, a flight information board showed multiple delays and cancellations in departures from Dulles International Airport in Washington, DC. (Photo by Roberto Schmidt) M ore than 24 hours after a security update on computers running the Microsoft Windows operating system caused a massive global outage , air travelers in the U.S.

are looking at a second day of disruption. On Friday, American travelers saw nearly 13,000 flight delays and 3,400 cancellations , according to data from FlightAware . All told, roughly 60% of all flights departing from U.

S. airports Friday were disrupted. As of 11:30 a.

m. Eastern Time on Saturday, there were more than 1,143 canceled flights in the U.S.

and 2,867 delays, according to data from FlightAware . In effect, roughly 16% of all flights departing from U.S.

airports Saturday are facing disruption before noon. Delta and United Airlines have been hit the hardest with 494 and 275 cancellations, respectively, on Saturday morning. “The high cancellation rates by Delta and United today is likely an attempt to return their operating schedule to normal operations as quickly as possible,” says a spokesperson from Cirium , an aviation analytics company, noting that as Australia has ended its Saturday with more than 5% of its flights being canceled.

“That gives an indication of where things are headed for the U.S. and Canada in particular.

” The five U.S. airports with the most cancellations.