Airline investors seem to have shrugged off the thousands of U.S. flight cancellationsEven though disruptions were not stopped on Monday due to the holidays, they continued.

Carriers scrubbed more than 1,700 U.S. flights on Monday on top of more than 5,400 over the weekend, driven largely by severe winter weather that hobbled some of the country’s busiest airports. The flight disruptions ended on Monday, though, and there were approximately 250 cancellations for Tuesday.

Carrier include Delta Air Lines, United AirlinesAnd JetBlue AirwaysCrews became increasingly sick due to the rapid-spreading Covid omicron variant. As its personnel tested positive, the Federal Aviation Administration warned of delays. the coronavirus.

United, SpiritAnd Alaskaare some of the companies that pay extra to their crew to collect trips.

Flight-tracking website FlightAware reports that airlines cancelled more than 13,000 flights from Christmas Eve to New Year’s Day. This is 5.6%. This number jumped to over 12% on Saturday after a severe winter storm ravaged the Midwest.

Premarket trading saw airline shares rise, which is a signal that investors are anticipating the next year when there will be more travel demand.

It is not yet known what the disruptions will cost. For carriers, whose executives were expecting some of the busiest day since the outbreak began, the holiday period was critical.

Stephen Trent, Citigroup analyst, said Monday that the variant might pose a “modest and near-term threat” to airlines because of staff quarantines, as well as the possibility that customers may delay their trips.

He said that “Nevertheless, rising vaccination rates and anti-viral treatment options are only a few of the factors which could cause negative stock market reactions to future variants to look more unreasonable.”

Premarket trading saw Alaska, United and American all rise close to 1%. The shares of Southwest AirlinesFlight cancellations on weekends, up 0.5%

The sector’s quarterly earnings reports will be released by Delta on January 13.