Many flights to the US already were in the air Friday when the president's order barred entry to citizens of seven predominantly Muslim nations.
Lawyers and advocates working at the airport yesterday said they didn't have a hard count on the number of people taken into custody after getting off their flights.
Yosre Ghaled, 25, was among about a dozen distraught people waiting at an airport terminal yesterday to see if loved ones would be released, or put back on an outgoing plane.
"We're very sad. She lives a very bad life. We try in her last days to (give her) a good life," Ghaled said, adding that the family had been told that she would be refused entry and put on a jet back to Saudi Arabia. "We've waited for this many years, (for) her to come. They should just let us see her. Seeing her would make you feel a little better."
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Two members of congress, Democrats Jerrold Nadler and Nydia Velazquez, joined several hundred protesters who spent part of the day at the airport trying to win the release of about a dozen people they said had been detained.
People in the crowd chanted "Let them in." Celebrities including "Sex and the City" actress Cynthia Nixon joined the demonstration.
The detainees in New York included two Iraqis who had previously been given permission to come to the US because of their ties to the US military.
He pronounced the US "the land of freedom" home to "the greatest people in the world" upon his release, but also expressed dismay about having been initially held.
Still being held at the airport in the late afternoon was Haider Sameer Abdulkhaleq Alshawi, 33, an Iraqi who had been trying to reunite with his wife in Texas. She had come to the US because she feared for her life after having worked for a US security contractor.
New York Gov. Andrew Cuomo, a Democrat, said he had directed state lawyers and the agency that controls Kennedy to "explore all legal options" to assist anyone detained at New York airports.
"I never thought I'd see the day when refugees, who have fled war-torn countries in search of a better life, would be turned away at our doorstep," Cuomo said. "This is not who we are, and not who we should be.