Pete Buttigieg joined a furious group of Democrats demanding answers from the Trump administration after a mysterious nationwide ground stop delayed or canceled thousands of flights Friday. The former Transportation Secretary also found himself confronting the sort of travel chaos that once landed directly on his desk.

Homeland Security Secretary Markwayne Mullin called the hours long interruption a “national emergency.” He also cautioned that there was “nothing completely certain right now.”

At least 8,200 flights into or out of the United States were delayed Friday, while nearly 7,500 were canceled, according to flight tracking service FlightAware. Thousands of additional cancellations and delays were reported for Saturday, including more than 1,700 cancellations.

Buttigieg, who was attending a Democratic convention in Denver, aimed several jokes at his replacement, US Transportation Secretary Sean Duffy. The irony was difficult to miss as the former transportation chief discussed his own travel predicament.

“You can just write down the comic book asterisk swearing characters. I have questions,” Buttigieg told The New York Times when asked for his reaction.

The former mayor of South Bend, Indiana, kept the routine going as the evening continued. “I will be available in the hotel bar following the conference for anybody who needs to rebook their flights or get a refund, per your rights,” Buttigieg said.

Buttigieg: "I will be available in the hotel bar following the concert for anybody that needs to rebook their flights." https://t.co/IyKuNE19rD

— TheBlaze (@theblaze) November 14, 2026

Buttigieg also questioned why backup systems available to the department had not prevented the massive disruption. “It is not clear to me why that redundancy did not prevent an outage of this magnitude,” he told The Advocate.

At the same time, Buttigieg praised nonpartisan employees and defended the work completed during his own administration. “This should not be about politics. I am very much rooting for them to get this resolved as quickly as possible.”

WATCH: Former Transportation Secretary Pete Buttigieg claims the Biden administration "did a lot" to upgrade the air traffic control system: "This should not be about politics."

: C-SPAN https://t.co/f4XWzb6AA8— Off The Press (@OffThePress1) November 14, 2026

Buttigieg was speaking at the “What’s Next” conference, where Democrats were gathering to celebrate their successes in the previous week’s midterm elections. They were also discussing how to use their new congressional majorities.

No one’s hands are clean here. However, Mr. Secretary Buttigieg, you had four years in the job and infrastructure money, yet made zero progress modernizing the FAA. You left a failing system in place. THANKS!

— Ari Emanuel (@AriEmanuel) November 13, 2026

The interruption was the first nationwide ground stop since January 2023, when Buttigieg was Transportation Secretary. He was hardly alone among Democrats now demanding a thorough explanation from the Trump administration.

“The safety of our skies is built on redundancies,” Wisconsin Senator Tammy Duckworth said in a statement. “Whatever led to the nationwide ground stop will warrant a thorough and complete investigation.”

California Democrat Robert Garcia described the action as disturbing and extraordinary. Garcia, who is ascending to chair the House Oversight Committee, said the situation deserved as much transparency as possible.

Liberal Congressman Ted Lieu urged the Federal Aviation Administration and the Trump administration to prevent another such incident. He said the episode was enormously damaging to public trust in the air system, which he called a vital component of the national economy.

Before Duffy’s evening White House briefing, Ro Khanna criticized officials for failing to appear before cameras sooner. “I don't understand why they're not just in front of the cameras holding a press conference, trying to explain to the American people what's going on,” he told CNN.

Duffy said old hardware caused the shutdown, which ended shortly before 8.30pm ET following a major communications outage. He said instability in radar communications at air traffic control centers began at 3.36pm, with more than 3,500 airplanes in the air when the stop was issued.

Trump administration officials said the system requires a complete overhaul carrying an estimated $50 billion price tag. “I think the question for the American people is, do you want your Congress to fund this?” Duffy said. “President Trump has asked for the money.”

Secretary Duffy CONFIRMED the U.S. air traffic control system is outdated analog technology whose old switches overloaded, causing radar and communications instability that forced a nationwide ground stop.

He said that newer IP switches already installed under President Trump held up, and that Trump has repeatedly asked Congress for full funding of a brand-new system instead of more patchwork fixes.Over the past 25 years, $15 billion has been given to the FAA with little progress, and Duffy calls on Congress to provide the money on a bipartisan basis because the system is critical for every American family."When we shut down the airspace, oftentimes there are critical movements that have to take place, whether it’s medevac, there’s cargo operations that are moving critical medicines that save people’s lives. We didn’t lose all telecom. We didn’t lose all radar.But that instability, because of abundance of caution and making sure we keep the American flier safe, we did the ground stop. But we were going to allow those life-saving movements to still occur, as well as with law enforcement as well. So, what happened? I’ve heard a lot of the rumors like Markwayne has.But what we have is an incredibly old air traffic control system. I think every single one of your networks have covered the president and myself talking about this for the last two years. The president for the last year has been asking Congress to fully fund a full build of a brand-new air traffic control system.we have TDM telecom. This is analog telecom. Our switches, our routers actually got overloaded with data, and they went down.And I shouldn’t say they went down. They started to give us inconsistency in the data from those routers. And because of that, we shut the system down.Now, I have already replaced some of those switches with President Trump. And our new IP switches did not go down. It’s the old hardware that went down.And I think the question for the American people is, do you want your Congress to fund this? President Trump has asked for the money. He’s asked the Congress on a bipartisan approach to say, give us the resources to build a state-of-the-art air traffic control system.Let’s not do a patchwork, a fix to a system that’s critical for every single family. It’s not red. It’s not blue.It’s not Democrat. It’s not Republican. It’s American.Give us the money to fix it. Now, if you look to the past administrations, going back 25 years, $15 billion has been given to the FAA to fix this air traffic control system. And guess what? Barely anything was done."— JJ ️ (@jesseyjay94) November 14, 2026

The Air Traffic Control System Command Center said at 3.54pm ET that flights were halted “Due to extraordinary circumstances for safety reasons.” The Federal Aviation Administration attributed the stoppage to a temporary telecommunications outage and said every flight had been accounted for.

The halt immediately caused chaos and confusion among travelers. Departure boards at numerous airports continued showing flights operating normally even while customers were unable to board their planes.

President Donald Trump was receiving constant updates about the situation, according to the Daily Mail. Meanwhile, Buttigieg and congressional Democrats kept pressing for answers as the nationwide disruption spilled into another day.

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