In this May 2, 2016 file photo, Yaney Cajigal, left, holds out a Stars and Stripes, and Dalwin Valdes holds a Cuban national flag, as they watch the arrival of Carnival's Adonia cruise ship from Miami, in Havana, Cuba, the first step toward a future in which thousands of ships a year could cross the Florida Straits, long closed to most U.S.-Cuba traffic. A rare 2016 poll of Cuban public opinion has found that most Cubans approve of normal relations with the United States and large majorities want more tourism and private business ownership. (AP Photo/Fernando Medina, File)