Communist Threat to the U.S. Through the Caribbean. hearings before the United States Senate Committee on the Judiciary, Subcommittee To Investigate the Administration of the Internal Security Act and Other Internal Security Laws, Eighty-Sixth Congress, second session, on May 26, 1960. Part 6 :

Continuation of hearings on communist activities in the Caribbean. Focuses on allegations that the communist takeover in Cuba so seriously damaged the quality of Cuba's air traffic control system that further U.S. use of Cuban air space might be extremely dangerous.