Air traffic operations were gradually returning to normal, the Federal Aviation Administration said after a systems failure grounded thousands of flights on Wednesday morning.
Thousands of flights were once again able to depart major US airports on Wednesday morning after the Federal Aviation Administration (FAA) lifted a nationwide halt on all domestic flights following a failure of its communications system earlier in the day.
At around 9 a.m. Eastern Time (1400 UTC/GMT), the FAA said that the ground stops it ordered earlier Wednesday were lifted.
What Was Behind the Disruption?
The agency ordered all domestic flights to be paused in the early hours of the morning as it worked to restore a system called NOTAM, or Notice to Air Missions system, which issues safety notices to pilots.
The communications system is critical because it alerts pilots to hazards in the air or on the ground, from the accumulation of snow on the runway to visibility issues to birds near the airport.
“Normal air traffic operations are resuming gradually across the US following an overnight outage to the Notice to Air Missions system that provides safety info to flight crews,” the FAA wrote. “We continue to look into the cause of the initial problem,” the agency said.
Update 4: The FAA is making progress in restoring its Notice to Air Missions system following an overnight outage. Departures are resuming at @EWRairport and @ATLairport due to air traffic congestion in those areas. We expect departures to resume at other airports at 9 a.m. ET.
— The FAA ✈️ (@FAANews) January 11, 2023
The White House Press Secretary Karine Jean-Pierre said there was no evidence of a cyberattack at present, but President Joe Biden “directed DOT [US Department of Transportation] to conduct a full investigation into the causes.”
“There was a systems issue overnight that led to a ground stop because of the way safety information was moving through the system,” Transportation Secretary Pete Buttigieg told reporters.
In regards to the investigation, Buttigieg said the “immediate focus is technical, understanding exactly how this happened, why the redundancies and the backups that were built into the system were not able to prevent the level of disruption.”
US lawmakers, such as Democratic Senate Commerce Committee Chair Maria Cantwell, have said there will be a review of the disruption at the congressional level.
Flights Were Gradually Cleared for Departure
Around 8:30 a.m. Eastern Time (1330 GMT), the FAA said it cleared flights to depart at Newark Liberty Airport, which serves the New York City area, and the Hartsfield-Jackson Airport in Atlanta. The agency then said it was hoping flights would soon resume at other airports.
More than 4,000 flights had been delayed by the time, according to FlightAware, a flight tracking website. Another 640 flights had been canceled.
The President has been briefed by the Secretary of Transportation this morning on the FAA system outage. There is no evidence of a cyberattack at this point, but the President directed DOT to conduct a full investigation into the causes. The FAA will provide regular updates.
— Karine Jean-Pierre (@PressSec) January 11, 2023
A spokesperson at Germany’s Frankfurt Airport told DW at the time of disruption that flights departing to the US were not affected at the airport. But, media reports said several flights from Spain’s Madrid international airport to the US were delayed.
Travelers Updated Through the Hours of Disruption
A little after issuing its first alert to notify users about the outage around 7:30 Eastern Time (1200 GMT), the FAA sent out a second alert saying some “functions are beginning to come back online.”
The agency said in a third update that it had ordered airlines to pause all domestic departures until 9 a.m. Eastern Standard Time (1400 GMT) to allow it to validate the “integrity of flight and safety information.”
Update 3: The FAA is still working to fully restore the Notice to Air Missions system following an outage.⁰⁰The FAA has ordered airlines to pause all domestic departures until 9 a.m. Eastern Time to allow the agency to validate the integrity of flight and safety information.
— The FAA ✈️ (@FAANews) January 11, 2023
Thousands of Flights Delayed
As of 6:30 a.m. Eastern Standard Time (1130 GMT), around 760 delays were reported, according to FlightAware. The website reported at the time that massive delays were across flights flying into and traveling out of the US.
American Airlines then confirmed that the outage was affecting all flights, including all carriers.
“We are performing final validation checks and reloading the system now,” the FAA said at the time. The aviation agency noted they would update people as soon as more information became available.
Captain Chris Torres said the outage could even affect air traffic through Friday.
“This thing was lifted at 9 a.m. Eastern. That doesn’t mean the problem stops at 9 a.m. This is going to cause ripple effects,” Torres said.
As of 4:35 p.m. Eastern Time Wednesday, FlightAware reported 8,925 delays in the US and 1,290 cancellations nationwide.
