In 1937, Imperial Airways and Pan American World Airways began operating scheduled flying-boat airline services from New York and Baltimore to Darrell's Island, Bermuda. In 1948, regularly scheduled commercial airline service by land-based aeroplanes began to Kindley Field (now L.F. Wade International Airport), helping tourism to reach its peak in the 1960s–1970s. By the end of the 1970s, international business had supplanted tourism as the dominant sector of Bermuda's economy (see Economy of Bermuda).
What became the main source of Bermuda's economy in the 1970's?
international business