What to Know About Friday’s Nationwide Ground Stop

The air traffic control system’s overloaded, antiquated telecommunications equipment sustained its latest widespread failure, prompting a call for more money to fuel faster upgrades.Passengers at Ronald Reagan Washington National Airport on Friday.

K Karoun Demirjian

Flight Canceled During the FAA Ground Stop? Here’s What to Do.

Travelers are entitled to refunds if their flights are canceled, regardless of the reason, but airlines won’t guarantee other amenities, such as a hotel room or meal vouchers.Travelers at Ronald Reagan National Airport in Washington on Friday.

C Christine Chung

Nvidia Scandal Prompts Questions of What It Means to Be a Spy

U.S. intelligence agencies believe a woman who had an affair with Jensen Huang was a Chinese asset. But there is much more that they are still assessing about her role.There remains much that intelligence agencies are assessing about Alice Huang, whose relationship with Jensen Huang has come under i

J Julian E. Barnes, Maggie Haberman and Jonathan Swan

Why Jensen Huang Was Essential to Nvidia’s Rise

Jensen Huang was the driving force at Nvidia, with 60 direct reports and no clear succession plan. Tripp Mickle, one of our technology reporters, examines Mr. Huang’s central role in the company and the artificial intelligence industry.

T Tripp Mickle, Gilad Thaler, Thomas Vollkommer, Shawn Paik, Nikolay Nikolov, James Surdam, Rafaela Balster, June Kim and Mark Oltmanns

Wall Street Loses a Powerful Dealmaker After Nvidia’s CEO Is Ousted

The ousted Nvidia chief executive was the consummate dealmaker leading the trillion-dollar A.I. build out.Some Wall Street bankers, traders and even some of Nvidia’s competitors are wondering and worrying about whether Jensen Huang’s departure will slow the breakneck pace of Nvidia’s investments.

M Maureen Farrell and Rob Copeland

Developer Avoided Stricter Oversight Before Fatal Building Collapse

By winning approval for a three-story building, then seeking to add more stories, the Brooklyn developer was not subject to the more rigorous oversight required for larger projects.A site on Bedford Avenue in Brooklyn was under construction when a neighboring building collapsed.

S Stefanos Chen, Mihir Zaveri, Amy Julia Harris, Bianca Pallaro, Dionne Searcey and William K. Rashbaum

Book Review: ‘Promise Me, America,’ by Joe Biden

The former president’s new memoir trumpets his achievements while justifying his decision to run for a second term and his embrace of Israel’s war in Gaza.Joe Biden’s memoir runs on two tracks: steady pragmatism and accelerating grandiosity.

J Jennifer Szalai

A ‘Generational Clash’ Is Fueling Europe’s Protests

As retirees live longer, governments need to spend more on pensions. That makes it harder to fund other services, spurring protests like those planned this weekend in France.Students protesting last month in Paris. France is struggling to maintain both its education sector and its pension payments.

J Jason Horowitz

Microsoft’s Global Outage and Fixes: What We Know

The company described “encouraging” progress on efforts to overcome a second day of disruptions to its email, messaging and other services.Microsoft said it was working to repair its services after a global outage that began on Thursday.

M Michael Levenson

Russia Revives Demand That NATO Retrench to Secure Ukraine Deal

The hard-line position of Russian officials in closed-door negotiations about ending the war thrusts European security into the heart of the talks.Steve Witkoff, center left, and Jared Kushner, the U.S. envoys, with Kirill Dmitriev of Russia, right, in Moscow on Thursday.

A Anton Troianovski, Andrew E. Kramer, Jeanna Smialek, David E. Sanger and Eric Schmitt

Democrats Vie for Support in Race for Top Senate Job

Senator Chris Van Hollen of Maryland said he wouldn’t run for president to focus on his leadership challenge to Senator Chuck Schumer, who remained confident he would prevail.Chris Van Hollen se había perfilado como el favorito para desafiar a Chuck Schumer por el puesto y en los últimos días había

C Carl Hulse

Trump Officials Press Congress to Renew Spying Law in Lame-Duck Session

The request to extend a high-profile warrantless surveillance law would add a thorny issue during waning Republican control.In a letter to congressional leaders, three top national security officials in the Trump administration said the president was urging them to extend a surveillance law.

C Charlie Savage and Dustin Volz

Howard Lutnick Has Got to Go

The secretary of commerce is almost as responsible for Nvidia’s crisis as the fallen chief executive Jensen Huang.

C Chris McGuire