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Photo: Kevin Dietsch/Getty Images

Southwest Airlines canceled more than 350 flights and delayed around 600 others on Monday after mass cancellations over the weekend from what the airline called "operational challenges," according to AP.

Driving the news: The cancellations started after its pilots asked a court to block the company's new COVID vaccine mandate, though Southwest said Sunday the service disruptions were not a result of a planned labor demonstration by its pilots, Axios' Michael Mooney and Ben Montgomery report.

  • The Dallas-based airline canceled about 1,900 flights over the weekend, citing air traffic control issues and bad weather, AP reports.

The big picture: The company said Monday it expects normal service to return this week, according to Reuters.

Go deeper: Southwest Airlines denies that pilot "sick out" drove weekend of delays

Go deeper

Piedmont Airlines flight attendants vote to authorize strike

Unionized flight attendants for American Eagle carrier Piedmont Airlines protest outside Philadelphia International Airport. Photo courtesy of Natalie Sowinski/Philadelphia Council AFL-CIO

Flight attendants for an American Airlines subsidiary with a base in Philadelphia voted to authorize a strike Thursday.

Driving the news: Members of the union representing flight attendants for American Eagle carrier Piedmont Airlines picketed outside Philadelphia Airport (PHL) following the vote, according to the Association of Flight Attendants-CWA.

Why it matters: AFA's strike strategy "could affect the entire system or a single flight," the union said in a news release.

  • "Even the disruption of a few flights could threaten operations across the American Airlines Group system," AFA said.

NYC to impose vaccine mandate on private employers

New York City Mayor Bill de Blasio (D) announced a new COVID vaccine mandate for private companies during a Monday interview with MSNBC's "Morning Joe."

Why it matters: De Blasio said it was a "first-in-the-nation measure" and will go into effect starting Dec. 27.

D.C.-Beijing tensions are shifting markets

Illustration: Aïda Amer/Axios

U.S. markets stand to lose $2 trillion in value if D.C. and Beijing drift further apart.

Why it matters: Political chasms are showing up in new securities regulations that put companies and investors in a bind. The rules are also another reflection of how much relations between the world’s largest economies have cooled, even as they remain economically interdependent.