Brazilian authorities oversee air travel safety in Brazil. It is best for you to familiarize yourself with the local safety requirements in order to assess how safe air travel is.
Guidance on air travel in Brazil can be found at FAA.com.
The U.S. Federal Aviation Administration (FAA) has assessed the government of Brazil’s Civil Aviation Authority as being in compliance with International Civil Aviation Organization (ICAO) aviation safety standards for oversight of Brazil’s air carrier operations. Further information may be found on the FAA’s safety assessment page.
As with any type of travel, being aware of safety standards, using caution and common sense will ensure you have a pleasant trip to Brazil.