Airlines keep slashing flights due to staff sickness caused by COVID-19. More than 2,200 flights have already been canceled for Wednesday.

Travelers have been hit with mass flight cancellation for the sixth day in a row due to rising levels of airline staff sickness and bad weather.

2,212 flights had been canceled as of Wednesday morning, according to figures from the flight- tracking website FlightAware. According to the website, 15,000 flights have been canceled since Friday morning.

714 of Wednesday's flights were within, into or out of the US, according to data at the time of writing.

The data shows that United Airlines has canceled more flights than any other airline.

Alaska Airlines has canceled 74 flights for Tuesday, or 11 percent of its flights, while JetBlue has canceled 78 flights, or 7 percent of its schedule.

Delta has canceled 88 flights, and Spirit has canceled 56.

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Insider was told that American Airlines and SkyWest canceled some flights due to rising cases of COVID-19 among staff. The airline's schedule was affected by the Omicron variant. The variant is the most popular strain in the US.

Heavy snow in Washington state on Sunday was one of the reasons for some flights being canceled.

More than 150 flights arriving in or departing from Seattle were canceled on Tuesday, or 24%, and just under half of the flights that went ahead were delayed. Almost 200 flights were already canceled as of Wednesday morning.

Air China has canceled 207 flights, or 17%, and China Eastern has canceled 441 flights, or 21%.

A city in central China with 13 million residents entered a strict lock down on December 23 due to a sudden surge in coronaviruses. According to FlightAware, as of Wednesday morning, 20% of the flights to and from the airport had been canceled.

Lion Air has canceled 22% of its schedule for Wednesday.

The airlines didn't reply to Insider's questions.

Since Christmas Eve, airlines have been canceling flights.

Almost half of the flights that were delayed or canceled were departures from or arriving in the US.

SkyWest canceled 362 flights, or 15% of its schedule, and had the highest percentage of flights canceled, at 24%, according to FlightAware data.

Almost half of the 3,300 flights canceled on Sunday and Monday were departures from or arriving in the US, according to FlightAware data.

There were 4,200 flights canceled on Christmas Eve and Christmas Day.

It's not just airlines that are affected. The New York City Transit Authority said on Sunday that subways would be less frequent because of the COVID-19 surge. Almost 90 cruise ships are being watched by the CDC.