NEW YORK — President Donald Trump’s executive order closing the nation’s borders to refugees appears to be in immediate effect.Refugees in the air or on the way to the United States when the order was signed are being stopped and detained at airports, according to immigration advocates. Tourists and those on study visas are not.(The Associated Press contributed to this report.) The other, Haider Sameer Abdulkhaleq Alshawi, was coming to the United States to join his wife, who had worked for a U.S. Refugee Agency, were stopped from boarding the plane after authorities at Cairo International Airport contacted their counterparts in JFK Airport.The airlines flying from this part of the world are updating their travel advisories to reflect the situation.KLM and Qatar Airways are indicating that green card holders or holders of diplomatic visas (A,G, C-2 or NATO,) from the seven countries are allowed to fly. Their immigration attorneys filed a writ of habeas corpus Saturday morning in the Eastern District of New York, seeking to have their clients released.At the same time, those attorneys filed a motion for class certification to represent all refugees and immigrants.According to court papers filed in downtown Brooklyn, one of the Iraqis at Kennedy Airport, Hameed Khalid Darweesh, had worked on behalf of the U.S. government in Iraq for 10 years. Kennedy International Airport since they arrived overnight. contractor, and young son.The men arrived on separate flights.Meanwhile, seven U.S.-bound migrants – six from Iraq and one from Yemen – have been prevented from boarding an EgyptAir flight to JFK.Officials said the action Saturday by the airport was the first since Trump imposed a three-month ban on refugees from seven Muslim-majority countries: Iraq, Syria, Iran, Sudan, Libya, Somalia and Yemen.The officials said the seven migrants, escorted by officials from the U.N. Two Iraqi refugees are being held at John F.