President Barack Obama waves goodbye as he boards Air Force One on his trip to Cuba from Joint Base Andrews, Md., March 20, 2016. Obama’s visit marks the first time a sitting U.S. president has traveled to the island nation since Jan. 16, 1928 when President Calvin Coolidge visited Havana, Cuba to address the Sixth Annual International Conference of American States. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

89th Airlift Wing Airmen (from the left) Staff Sgt Steven Howard, Special Air Missions Passenger Service supervisor, Capt. Paul Zeigler, 89 AW Protocol deputy director, Col. Christopher Thompson, 89th AW vice commander and Mrs. Thompson salute President Barack Obama aboard Air Force One as he departs to Havana, Cuba from Joint Base Andrews, Md., March 20, 2016. This is the first time a sitting United States president has visited Cuba in over 86 years. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)

Air Force One departs from Joint Base Andrews, Md., carrying United States President Barack Obama March 20, 2016. Obama and Cuban President Raul Castro restored diplomatic relations on July 20, 2015, with simultaneous speeches announcing their countries would begin normalizing relations. The last U.S. president to visit Cuba was Jimmy Carter on March, 2011. (U.S. Air Force photo by Senior Airman Joshua R. M. Dewberry/RELEASED)