By Lise Alves, Senior Contributing Reporter

SÃO PAULO, BRAZIL - São Paulo has one of the largest helicopter fleets in the world, with over 1,300 take-offs and landings in a single day. The increase of "pirate air taxis" however, has made it more dangerous for passengers to pay for an aerial tour of South America’s largest city or hire a helicopter as an air taxi for short trips to surrounding cities.

Local authorities and aeronautical officials are worried about the increase in the number of aircraft that are registered as private but are used as unlicensed . . .

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