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Photo: Gary Hershorn/Getty Images

Another 1,000 flights were canceled in the U.S. on Monday due to COVID-19 outbreaks among crews for a fourth straight day, with storms in the Pacific Northwest adding to the chaos, AP reports.

Why it matters: Thousands of customers have been affected by the latest pandemic-driven travel disruptions since Christmas Eve, with airlines including United blaming a "nationwide spike in Omicron cases" in recent days.

By the numbers: 1,278 flights were canceled entering, leaving, or within the U.S. on Monday evening, according to flight tracker FlightAware.

  • Thousands more have been canceled over the past few days — including more than 2,300 flights worldwide and another 690 in the U.S. on Christmas Eve.
  • The cancellations represent between 5% and 10% of each U.S. airline's flights, according to FlightAware.

Driving the news: Omicron has "had a direct impact on our flight crews and the people who run our operation," a United spokesperson said in an emailed statement on Friday, when the cancellations began.

  • "As a result, we've unfortunately had to cancel some flights and are notifying impacted customers in advance of them coming to the airport," the spokesperson said, noting that airline staff were working to rebook as many people as possible.
  • Delta said in a statement to Nexstar, "Delta teams have exhausted all options and resources — including rerouting and substitutions of aircraft and crews to cover scheduled flying — before canceling around 90 flights for Friday." The airline was also working on rebooking flights.
  • Two other major U.S. airlines — American and Southwest — aren't reporting problems with flight cancellations so far, per AP.

The big picture: Airlines for America (A4A), which lobbies on behalf of all major U.S. airlines, is urging the CDC to cut the quarantine period for fully vaccinated people to five days from symptom onset due to the threat of Omicron.

  • "The Omicron surge may exacerbate personnel shortages and create significant disruptions to our workforce and operations," A4A CEO Nick Calio said in a letter Thursday to CDC Director Rochelle Walensky, per ABC News.
  •  The Association of Flight Attendants-CWA wrote to the CDC on Thursday to advocate for the 10-day isolation period to remain.
  • "Flight Attendants should not be expected to return to work until they test negative and do not exhibit symptoms," wrote flight attendants union president Sara Nelson.
  • Axios has contacted all affected airlines for comment.

Go deeper: Travel whiplash: Omicron upends holiday plans

Editor's note: This article has been updated with the latest cancellation statistics.

Go deeper

Updated 4 hours ago - Politics & Policy

Omicron dashboard

Illustration: Brendan Lynch/Axios

  1. Health: Omicron pushes COVID deaths toward 2,000 per day — The pandemic-proof health care giant.
  2. Vaccines: No evidence that healthy children, teens need boosters, WHO says — Starbucks drops worker vaccine or test requirement after SCOTUS ruling — Kids' COVID vaccination rates are particularly low in rural America.
  3. Politics: Biden concedes U.S. should have done more testing — Arizona says it "will not be intimidated" by Biden on anti-mask school policies.
  4. World: American Airlines flight to London forced to turn around over mask dispute — WHO: COVID health emergency could end this year — Greece imposes vaccine mandate for people 60 and older.
  5. Variant tracker

First look: Senators propose bill to ban corporate PACs

Sens. Jon Ossoff and Mark Kelly. Photos: Chip Somodevilla (left), Courtney Pedroza/Getty Images

Sens. Mark Kelly (D-Ariz.) and Jon Ossoff (D-Ga.) will soon propose a bill prohibiting for-profit corporations from establishing and managing political action committees, according to a copy of the legislation obtained by Axios.

Why it matters: The introduction of "The Ban Corporate PACs Act" comes amid heightened scrutiny on Capitol Hill regarding money in politics, including efforts to bar companies from influencing political campaigns and federal elections. It would likely face a court challenge and First Amendment concerns.

42 mins ago - Technology

Exclusive: YouTube shuts down two Oath Keepers channels

Stewart Rhodes, founder of Oath Keepers. (Photo: Aaron C. Davis/The Washington Post via Getty Images)

YouTube has deactivated two channels linked to the Oath Keepers militia group whose members have been charged in relation to the January 6 Capitol riot, the company told Axios.

The big picture: Social media platforms that were used to plan or promote the Capitol attack have moved with varying degrees of speed to bar the accounts involved.