Thousands of air travelers across the United States probably ended their holiday weekend to be anything but merry, ABC7 reported.

This, as over 2, 000 flights were canceled since Christmas Eve due to the recent spike in COVID-19 cases that affected even airline crews.

The cancellations happened right after Christmas which is said to be the third busiest day to travel for return flights.

On Sunday, flight cancellations in those entering or leaving the country reached 820, the flight-tracking website FlightAware said. It also left 2, 500 delayed flights.

Delta canceled 133 flights as of Sunday at 1:30; JetBlue canceled 110; United canceled 103; and American Airlines canceled 74, FlightAware said.

A total of 997 flights were canceled on Christmas Day, and 689 suffered the same fate on Christmas Eve.

JetBlue and Delta, wanting to solve the crew shortage, reached out to the U.S. Centers for Disease Control and Prevention to ask to cut the vaccinated persons’ quarantine period to five days.

Meanwhile, travelers are encouraged to check their airports and airlines to get updated flight details.