HAVANA, CUBA - MARCH 20: U.S. President Barack Obama and Michelle Obama arrive at Jose Marti International Airport on Airforce One for a 48-hour visit on March 20, 2016 in Havana, Cuba. Mr. Obama's visit is the first in nearly 90 years for a sitting president, the last one being Calvin Coolidge. (Photo by Joe Raedle/Getty Images)
