America's air traffic control meltdown: How US flight crisis unfolded & what next

For several hours on Friday, one of the world's busiest aviation networks came to a near standstill. Airports across the United States witnessed mounting delays, grounded departures and diverted aircraft after a communications failure forced the Federal Aviation Administration (FAA) to halt flight operations nationwide. Thousands of passengers were left stranded as airlines struggled to manage the disruption.The FAA imposed the nationwide ground stop on November 13 after communications problems affected air traffic control centres across the country.

Although aircraft already in the air were allowed to continue towards their destinations, departures remained suspended for more than four hours.The shutdown, the second nationwide aviation stoppage of its kind since the September 11, 2001, attacks, affected an estimated 1.5 million passengers. More than 10,000 flights were delayed or cancelled, while hundreds were diverted.The FAA lifted the restrictions at 8:15 pm ET.

However, the disruption continued as airlines worked to reposition aircraft and crew. US Transportation Secretary Sean Duffy warned that similar incidents could happen again unless the country's ageing aviation infrastructure was overhauled.Here is how the disruption unfolded, what triggered the shutdown and how authorities responded and why the impact could continue beyond Friday.How it unfolded: From communication failure to nationwide ground stopThe disruption began at around 3:36pm ET on Friday, when the FAA experienced telecommunications problems at air traffic control facilities and Terminal Radar Approach Control (TRACON) centres across the country.The outage affected multiple Air Route Traffic Control Centers, including the 22 regional facilities responsible for guiding aircraft travelling between airports.

Citing safety concerns, the FAA ordered a nationwide ground stop to prevent further departures.The agency described the situation as a telecommunications outage and said the restrictions were imposed “due to extraordinary circumstances and for reasons of safety”.At the time, more than 3,500 aircraft were airborne across the United States. Flights already in the air were allowed to continue towards their destinations, with pilots and air traffic controllers following established procedures to ensure safe landings.Providing a timeline of the disruption in a post on X, US Transportation Secretary Sean Duffy said the number of aircraft in US airspace had fallen to fewer than 400 by 8 pm ET as planes landed safely.Duffy clarified that the FAA had not completely lost its radar or telecommunications capabilities during the outage.

Exceptions were also made for critical medical evacuation flights, life-saving cargo operations and law enforcement aircraft to continue operating.International flights were handled on a case-by-case basis, while airlines adjusted their schedules to manage the disruption.The FAA lifted the nationwide ground stop at 8:15 pm ET after the affected systems began recovering. However, the resumption of departures did not immediately restore normal operations, as airlines continued to deal with delays, cancellations and aircraft displaced from their scheduled routes.What triggered the disruption Transportation secretary Sean Duffy attributed the disruption to ageing communications equipment that became overloaded with data and began transmitting inconsistent information to air traffic controllers.Speaking at a White House briefing, Duffy said the system experienced intermittent radar and communication failures, prompting the FAA to shut it down."We have old, old switches, old routers.

We use 1980s little copper lines," Duffy said.He described the failure as a breakdown of legacy equipment that had remained in use for decades."What went down was old, right? It was the old legacy equipment. It failed," he said."And listen, it's going to continue to fail."The communications network is used by air traffic controllers to coordinate aircraft movements and maintain contact with pilots.

When such systems become unreliable, authorities may restrict departures to prevent additional aircraft from entering an already disrupted airspace system.What happens to planes already in the air?When the FAA orders a nationwide ground stop, aircraft already airborne are not automatically instructed to make emergency landings. The restriction primarily applies to departures, while flights in the air continue to be managed by air traffic controllers using available communication and surveillance systems.During the November 13 disruption, more than 3,500 aircraft were airborne when the FAA imposed the restrictions, according to US Transportation Secretary Sean Duffy.

Pilots and air traffic controllers followed established procedures to land the aircraft safely. Duffy said the number of planes in US airspace had fallen to fewer than 400 by 8 pm ET. He also clarified that the FAA had not completely lost its radar or telecommunications capabilities.However, the situation becomes more complicated if an aircraft loses two-way radio communication with air traffic controllers.

The FAA's Aeronautical Information Manual (AIM), under Section 6-4-1, lays down procedures for such situations, referring pilots to 14 CFR Section 91.185, which governs instrument flight rules (IFR) operations during communication failures.Under these rules, pilots encountering a communication failure in visual meteorological conditions (VMC) are required to continue flying under visual flight rules (VFR) and land as soon as practicable.

This does not necessarily mean landing at the nearest airport. The FAA clarifies that pilots can use their judgement and are not required to land at an unsuitable airport or abandon a destination when landing there remains practicable.If the failure occurs under instrument meteorological conditions (IMC), pilots must follow specific route and altitude procedures. They are required to follow the last route assigned by air traffic…