 The certified airlines operating in Puerto Rico in 1950 were Pan American World Airways, Eastern Air Lines, Caribbean Atlantic Airlines, British Airways, Iberia, Dominican Airlines and Flying Tigers Airline.The latter contracted the movement of migrant workers to the United States, with the Insular Department of Labor, transferring some 5,706 workers to different points of that nation, at a cost of $55 per passage.On May 22, 1955, the Puerto Rico International Airport was inaugurated, built on a 1,718.72 acre land lot.