KEY POINTS
  • More than 18,000 U.S. flights have been cancelled since Christmas Eve.
  • Airlines have blamed the disruptions on a combination of bad weather and omicron infections that sidelined staff.
  • Investors on Monday shrugged off the holiday cancellations.
Airline pilots walk through the Ronald Reagan Washington National Airport on December 27, 2021 in Arlington, Virginia.

Airline investors shrugged off thousands of U.S. flight cancellations over the holidays even as airlines' rough start to 2022 got worse.

Carriers scrubbed more than 3,100 U.S. flights on Monday — the biggest daily total since Feb. 15, according to airline data provider FlightAware. That was on top of more than 5,400 over the weekend, driven largely by severe winter weather that has hobbled some of the country's busiest airports from Seattle to Washington D.C, and a surge in Covid infections among flight crews.