US Transport chief says unclear if 'incompetence' or bad tech to blame for groundings

Air carriers in the US canceled some 16,000 flights over the past 24 hours in the biggest such grounding since 9/11. Officials hinted that incompetence or faulty equipment, not malfeasance, is the cause.

US Federal Aviation Administration officials and Transportation Secretary Sean Duffy on Saturday said that investigations are ongoing in an attempt to find the cause of the largest mass grounding of flights in the country in over 25 years. International carriers were also forced to cancel flights to the US , and the massive backlog prompted, among other things, the rescheduling of dozens of college and professional sporting events — a staple of many Americans' weekends.