Context: 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).

Question: What did Imperial Airways and Pan American begin scheduling in 1937?
Answer: flying-boat airline services from New York and Baltimore to Darrell's Island, Bermuda

Question: What helped tourism grow to new heights in the 1960-1970's?
Answer: regularly scheduled commercial airline service by land-based aeroplanes

Question: What became the main source of Bermuda's economy in the 1970's?
Answer: international business

Question: Who began operating scheduled services in 1973?
Answer: Unanswerable

Question: What did Imperial World Airways and Pan American Airways begin doing in 1937?
Answer: Unanswerable

Question: What is now known as F.L. Wade International Airport?
Answer: Unanswerable

Question: What reached a peak in 1960?
Answer: Unanswerable