US airlines have scrapped almost 1000 flights on Christmas Day, the second straight day of massive cancellations as surging COVID-19 infections have sidelined some pilots and other crew members, upending plans for tens of thousands of holiday travellers over the Christmas weekend.
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A total of 957 Christmas Day flights, including domestic flights and those into or out of the country, were cancelled, up from 690 on Christmas Eve, according to a running tally on flight-tracking website FlightAware.com. Nearly 2000 flights were delayed.
At least one airline said that it expected hundreds more cancellations on Sunday.
The Christmas holidays are typically a peak time for air travel, but the rapid spread of the highly transmissible Omicron variant has led to a sharp increase in COVID-19 infections, forcing airlines to cancel flights as pilots and crew need to be quarantined.
United Airlines cancelled 230 flights while American Airlines called off 90 flights, representatives for the companies said in separate statements.
"The nationwide spike in Omicron cases this week has had a direct impact on our flight crews and the people who run our operation," United spokesperson Maddie King said.
She said the cancellations made up a small portion of United's 4000 average daily flights during the holiday season.
Winter weather and Omicron forced Delta Air Lines to scrub 344 flights on Saturday, of approximately 3000 scheduled flights, "after exhausting all options and resources to prevent those cancellations," a spokesperson for the company said, adding that the impact was likely to persist on Sunday.
"Delta expects more than 300 of its flights will be cancelled on Sunday, December 26," the spokesperson said.
Globally, FlightAware data showed that just over 2700 flights were called off on Saturday and another 7049 were delayed.
Among the most impacted US airports were Atlanta's Hartsfield-Jackson International, New Jersey's Newark Liberty International, Los Angeles International and New York's JFK International. Six out of the 10 global airports most hit by the cancellations were Chinese.
Not all airlines were affected equally. A spokesperson for Southwest Airlines said there were no issues to report with the carrier's flights on Saturday.
The Omicron variant was first detected in November and now accounts for nearly three-quarters of US cases and as many as 90 per cent in some areas, such as the Eastern Seaboard.
The average number of new US coronavirus cases has risen 45 per cent to 179,000 per day over the past week, according to a Reuters tally.
While recent research suggests Omicron produces milder illness and a lower rate of hospitalisations than previous variants of COVID-19, health officials have maintained a cautious note about the outlook.
Ahead of the Christmas holiday, Americans scrambled for COVID-19 tests and many went ahead with their travel plans.
US officials have said that people who are fully vaccinated should feel comfortable proceeding with holiday travel.
Australian Associated Press
