Americans returning from Europe found themselves in a crowded hell of delays and long lines Saturday night at the 13 airports selected to handle their incoming flights under new rules enacted by the Trump administration to combat the spread of the coronavirus.

John F. Kennedy, Newark and O’Hare international airports — three of the 13 airports selected to handle the flights — had massive crowds and hours-long waits as they attempted to return to the states.

“Just waiting in a very long line with thousands of people to clear Customs at JFK T4. Not sure who’s really taking things seriously,” tweeted Jake Vinson with photos of a sea of people waiting in line.

Vice President Mike Pence announced the new policy Thursday in an attempt to contain the spread of the COVID-19 — but the crowds only heightened flyers’ anxiety around the deadly virus.

“People coming from everywhere packed together without enough distancing & waiting for at least an hour… like a giant Petri dish,” tweeted Claudia Gonzaga from JFK.

Flyers at Newark were equally bothered.

“So the enhanced screening for #COVIDー19 also includes having everyone trying to get home from int’l flights stand super close together in massively long lines at customs? Cool, cool. Just making sure,” Lindsey Irwin posted.

Waits were so long at O’Hare that airport staff were handing out water and food to the mobs of people.

“The crowds & lines O’Hare are unacceptable & need to be addressed immediately,” Illinois Gov. J.B. Pritzker wrote.

Each airport attributed the lines to the “enhanced screening procedures” Pence and the federal government had put in place as the number of confirmed coronavirus cases climb in Europe and the U.S.

“The enhanced screening procedures have been established by our federal partners @CDCgov and @CBPNewYorkCity,” tweeted the official account for JFK. “They are working hard to process all passengers as quickly as they can. Thank you for your continued patience.”

The screenings target all passengers flying from the 26 European countries of the Schengen area, as well as anyone returning from China and Iran. Those passengers are also ordered to self-quarantine for two weeks.

“I understand this new process will be disruptive to some travelers, however, this action is needed to protect the general public from further exposure and spread of the coronavirus,” said Chad Wolf, the acting secretary Department of Homeland Security, when the policy was announced last week.