You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Bermuda

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 helped tourism grow to new heights in the 1960-1970's?

regularly scheduled commercial airline service by land-based aeroplanes