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Delta Airlines passenger aircrafts on the tarmac of John F. Kennedy International Airport in New York on Dec. 24.YUKI IWAMURA/AFP/Getty Images

Thousands of flights within the United States and internationally were delayed or cancelled on Friday, adding to the travel disruptions during the holiday week due to adverse weather and rising cases of the Omicron coronavirus variant.

More than 2,800 flights were cancelled globally as of Friday noon ET, including more than 1,400 flights within the United States or entering or departing it, according to a running tally on flight-tracking website There were more than 6,500 global flight delays in total.

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.

The sudden arrival of Omicron has brought record-setting case counts to countries around the world. Transportation agencies across the United States are suspending or reducing service due to COVID-19 staff shortages as the Omicron variant surges countrywide.

The number of new COVID-19 cases in the U.S. has doubled in eight days to a record high of 329,000 a day on average, according to a Reuters tally. Over that same period, the number of hospitalized COVID-19 patients rose 32 per cent and has hit a record high in Maryland and Ohio, and in Washington.

On Thursday alone, 23 states, Puerto Rico and Washington set pandemic records for new cases, according to the Reuters tally.

New York State reported more than 74,000 COVID-19 cases on Thursday from more than 336,000 tests at a 22-per-cent positivity rate, Governor Kathy Hochul said.

New York said last week it will sharply limit the number of people it allows in Times Square for its New Year’s Eve celebration, where the evening culminates with the dropping of a giant crystal ball at midnight, signalling the start of the new year.

“We reduced the density of the crowd. This is a safer way to proceed,” Tom Harris, the president of Times Square Alliance, told CNN on Friday. New York City mayor-elect Eric Adams will be sworn in after the ball drop.

Some critics, however, have raised concerns over the celebrations going ahead at all, given the high positivity rate.

The rise in U.S. COVID-19 cases has caused some companies, particularly in the energy sector, to change course from earlier plans to increase the number of employees working from their offices starting next week. Chevron Corp. was to start a full return to office from Jan. 3 but told employees this week it was postponing the plans to an unspecified date.

U.S. airline cabin crew, pilots and support staff are reluctant to work overtime during the holiday travel season despite offers of hefty financial incentives. Many workers fear contracting COVID-19 and do not welcome the prospect of dealing with unruly passengers, some airline unions have said.

In the months preceding the holidays, airlines were wooing employees to ensure solid staffing, after furloughing or laying off thousands over the past 18 months as the pandemic crippled the industry.

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