New coronavirus screening requirements are creating massive bottlenecks in airports, creating crowds that risk spreading the illness.

In Dallas, travelers posted photos on Twitter of long, winding lines in the airport. In New York, customs agents in paper and plastic masks boarded a flight from Paris. And in Chicago, where travelers reported standing in line for hours, Gov. J.B. Pritzker of Illinois tagged Mr. Trump in a series of angry tweets about the long waits, saying, “The federal government needs to get it’s s@#t together. NOW.”

Paige Hardy, an American student who left behind her graduate studies in London because she feared a broader travel ban, said a series of confusing announcements in the air and upon landing in Dallas led to alarm on the plane late Saturday. She posted a video on Twitter of travelers being asked to raise their hands if they had been in mainland Europe. Because of the delay, she also missed her connecting flight.

People were sharing appalling photos on Twitter Saturday of jam-packed airports as hordes of Americans flying home from overseas were being screened for coronavirus under new federal travel requirements instituted by President Donald Trump.

The crowds and hours-long waits were exactly what the Centers for Disease Control and Prevention have warned against as a dangerous way to spread the illness.

Photos revealed stalled wall-to-wall passengers in particular at New York City’s John F. Kennedy, Dallas/Fort Worth and Chicago’s  O’Hare International Airports. Officials at O’Hare were handing out disinfectant wipes among the mobbed travelers, according to witnesses.

Some Americans flying home from all countries under travel restrictions have been routed through 13 airports.

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