EXPLAINER: How NOTAM caused widespread flight disruptions


              Transportation Secretary Pete Buttigieg, speaks after speaking to the Transportation Research Board in Washington, Wednesday, Jan. 11, 2023. The world's largest aircraft fleet was grounded for hours by a cascading outage in a government system that delayed or canceled thousands of flights across the U.S. on Wednesday. (AP Photo/Manuel Balce Ceneta)
            
              People pass through Salt Lake City International Airport, Wednesday, Jan. 11, 2023, in Salt Lake City. The world's largest aircraft fleet was grounded for hours by a cascading outage in a government system that delayed or canceled thousands of flights across the U.S. (AP Photo/Rick Bowmer)
            
              A Southwest Airlines passenger jet takes off from Chicago's Midway Airport as flight delays stemming from a computer outage at the Federal Aviation Administration brought departures to a standstill across the U.S earlier Wednesday, Jan. 11, 2023, in Chicago. (AP Photo/Charles Rex Arbogast)
            
              Passenger jets are seen on the tarmac at Logan International Airport, Jan. 11, 2023, in Boston. Thousands of flight delays and cancellations rippled across the U.S. early Wednesday after computer outage led to a grounding order by the Federal Aviation Administration. (AP Photo/Steven Senne)