U.S. air travel remained disrupted Saturday as airlines canceled thousands more flights while the aviation system recovered from a near-five-hour nationwide grounding of departures on Nov. 13. The FAA forecast service would return to normal by the end of Nov. 15, although carriers warned schedules could remain unsettled until Monday. FAA chief Bryan Bedford said 12,000 flights were canceled on Nov. 13, while 4,000 to 5,000 of the 41,000 flights scheduled for Nov. 14 were likely to be canceled. The disruption followed intermittent voice and radar failures at as many as 17 of the FAA’s 22 regional control centers. Transportation Secretary Sean Duffy said L3Harris Technologies was replacing discontinued copper wire with fiber optics at a remote site when overloaded communication routers crashed the aging network; investigators also examined possible user error or a faulty router. More than 14,000 cancellations were reported across Friday and Saturday, with about 160 Sunday cancellations recorded by Saturday afternoon. Airlines repositioned aircraft and crews, offered waivers and refunds, and in some cases capped fares.