108 flights were canceled.
In the U.S., all flights had to be canceled due to problems with the pilot warning system. This is reported by NBC News.
Earlier, the Federal Aviation Administration reported about the failures. The problem affected the operation of the national air traffic control system.
"The FAA is working to resolve the problem quickly and safely so that air traffic can resume as normal," Transportation Secretary Pete Buttigich said in a post on Twitter.
According to FlightAware, more than 1,200 flights in the U.S. have been delayed and 108 flights have been canceled.