question: What helped tourism grow to new heights in the 1960-1970 's ?
answer: regularly scheduled commercial airline service by land-based aeroplanes
turker_answer: Regularly scheduled commercial airline service by land-based aeroplanes helped tourism grow to new heights in the 1960-1970 's .
rule-based: Regularly scheduled commercial airline service by land-based aeroplanes helped tourism grow to new heights in the 1960-1970 's .