The rise in Omicron cases has disrupted air travel, with more than 800 flights canceled by Reuters

(Reuters) – US airlines canceled 800 more flights on Monday after thousands of flights were cut off over the Christmas holiday weekend as Omicron cases are rising across the country, forcing crews to isolate and passengers looking for other types of travel.

Shares of American Airlines (NASDAQ 🙂 Group Inc., United Airlines Holdings (NASDAQ 🙂 Inc., Delta Air Line Inc. and Southwest Airlines (NYSE 🙂 Co. fell between 2% and 3% before the initial bell.

Nearly 740 flights were canceled on Monday morning in the United States, in or out, according to the website’s FlightAware.com flight tracking website.

The cancellation of Monday’s flights canceled more than 3,000 people over the Christmas holiday weekend, usually the peak time for Americans to travel.

With the rise in infections, airlines have been forced to cancel flights, pilots and cabin crew have had to be quarantined, and bad weather in some areas has added to passenger ailments.

Delta, United, Southwest and American did not immediately respond to Reuters’ comments.

Cruise operators Norwegian Cruise Line (NYSE 🙂 Holdings, Royal Caribbean (NYSE 🙂 Cruises Ltd and Carnival (NYSE 🙂 Corp. also fell between 1.3% and 2.4%.

Over the weekend, at least three cruise ships were forced to return to port after COVID-19 cases were detected on the ship, according to media reports.

Travel Companies Booking Holdings (NASDAQ 🙂 Inc, Airbnb Inc, Expedia (NASDAQ 🙂 Group Inc and Tripadvisor Inc fell 0.6% to 1.8%, respectively.