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Air travelers are aghast at the number of people crowding into airports in defiance of recommendations to stay home for the Thanksgiving holiday.

Dr. Dena Grayson, a doctor and researcher who describes herself as an Ebola expert, tweeted video Saturday taken in Arizona of a jammed Sky Harbor Airport in Phoenix.

“New #coronavirus cases will SKYROCKET in December, followed by hospitalizations, then deaths,” wrote Grayson, who in 2016 ran unsuccessfully for Congress in Florida.

Travelers also packed into O’Hare Airport in Chicago, according to one report.

In New York, some 670,000 passengers are expected to fly out of area airports, according to stats provided to The Post.