Nationwide ground stop followed contractor upgrade to L3Harris telecommunication system: DOT’s Duffy
US Transportation Secretary Sean Duffy (R) speaks alongside FAA Administrator Bryan Bedford (L) during a press briefing at the Department of Transportation headquarters building in Washington, DC, on November 14, 2026.
Aaron Schwartz | Afp | Getty Images
The longest halt in flight departures to U.S. airports since 9/11 came after updates to a telecommunications system managed by contractor L3Harris Technologies, Transportation Secretary Sean Duffy said Saturday, as hundreds of thousands of travelers were stranded by lingering disruptions.
There was “zero evidence” that the problem was caused by something “nefarious” or anything related to artificial intelligence, Bryan Bedford, the head of the Federal Aviation Administration, said at a press conference with Duffy.
The upgrades at “at least” one remote location were part of ongoing work of switching from a copper wire system to fiber, Duffy said.
A router had “flooded” other routers in the air traffic control system with over 1,000 connection attempts roughly every five seconds, the secretary said, creating problems with airplane communications and radar feeds.
The outage again thrust aging infrastructure that underpins U.S. air traffic control into the spotlight, along with the country’s struggles to replace sections of it while operating the world’s busiest airspace.
“What we’re working to determine was whether we had incompetence, meaning was it user error, installator error from L3 Harris, or did they install a faulty router,” he said.
L3Harris said it is “supporting the FAA in its investigation to understand the conditions that led to the Nov. 13 ground stop of our nation’s air travel.”
L3Harris said it has completed more than 70% of the switch from copper wiring to fiber-optic system.
Duffy took the groundstop to seek billions more from lawmakers to modernize the system.
Bedford said no FAA facilities went dark but that officials decided to ground flights because of “instability” in information feeds to air traffic control centers that handle en route aircraft at high altitudes and eventually to others closer to airports.
“We were unwilling to take any risk that this propagation could actually result in a center losing connectivity with aircraft,” said Bedford. He said officials weren’t sure for about 45 minutes what was causing the instability.
Flight disruptions mount
Flight disruptions continued on Saturday. More than 6,000 U.S. flights were canceled Saturday and close to 7,100 were delayed as of 6 p.m. ET, according to flight-tracking site FlightAware. That’s on top of about 9,000 U.S. flight cancellations, about a third of the day’s schedule, and more than 7,000 delays on Friday, though some disruptions were due to bad weather.
Friday had the second-highest U.S. flight cancellations since a severe blizzard and below-freezing temperatures in January, according to aviation-data firm Cirium.
People check in for their flights after the US Federal Aviation Administration (FAA) lifted a nationwide ground stop issued earlier due to “extraordinary circumstances and safety reasons,” following reports of serious air traffic control communication issues, at Newark Liberty International Airport in Newark, New Jersey, US, November 14, 2026.
Eduardo Munoz | Reuters
Part of untangling from the ground stop includes getting aircraft where they need to be. The ground stop forced many planes to divert to other airports, while dozens of planes had to park with limited gate space because flights couldn’t depart.
Airlines run one of the lightest schedules on Saturday and are deploying as many spare planes and crews as possible to get travelers and employees where they need to be as they’re eager to start fresh for the upcoming Thanksgiving holiday period.
Extra pay for flight crews
American Airlines, for example, is offering flight attendants extra pay to pick up trips, according to a person familiar with the airline’s plans.
Delta Air Lines offered crews double pay to pick up trips and gave them confirmed seats on flights to get them into position, according to internal company messages CNBC saw. United Airlines was also offering pilots and flight attendants extra pay to pick up flights through Sunday, according to people familiar with the matter.
American, along with other airlines, said it would change customers’ tickets at no fee or fare difference if the outage affected their plans and that it would cap some airfares.
Around 3 million people were scheduled to fly on Saturday, according to Cirium.
The FAA had halted departing U.S. flights around 4 p.m. ET on Friday, a ground stop that lasted more than four hours, the longest such pause on departing flights in 25 years.
Aging infrastructure
Duffy on Friday blamed outdated U.S. infrastructure for the problem and said Congress needs to approve more money to overhaul the country’s air traffic control. Aging equipment and a shortage of air traffic controllers have angered airline executives for years, who have complained about the cost of resulting disruptions.
It was the second time the FAA has issued a nationwide ground stop since the Sept. 11, 2001, terror attacks. Trump administration officials have repeatedly said it did not appear to be a cyberattack.
The U.S. has the world’s busiest airspace.
“Before clearing flights to resume, we thoroughly tested our systems to confirm they were stable and that operations remain reliable,” the FAA said late Friday.
The disruption also upended travel for NBA, NHL and college teams, which struggled to reach their destinations in time for games this weekend.
A general view of Charlotte Douglas International Airport in Charlotte, North Carolina, on Nov. 13, 2026, as passengers face delays and strandings after the FAA issued a nationwide ground stop for all flights.
Anadolu | Anadolu | Getty Images
College games postponed
Duffy said college football teams traveling on charter flights could receive priority.
“I would encourage those football teams to reach out to the FAA to schedule their flight times and make sure they have games going off tomorrow,” he said during a Friday press briefing.
The Southeastern Conference announced on X that some games had been moved to Sunday due to the flight disruption.
“We are in close communication with our member institutions to assess potential disruptions and coordinate appropriate responses,” the SEC said in a statement shared on X.
The National Football League said that it is putting in three backup referees for three games on Sunday because of the ground stop, “reassigning officials to games within driving distance of their hometowns.”
— CNBC’s April Roach and Jessica Golden contributed to this article.
