Before hiring an air taxi to take a plane or helicopter trip, it is important to know if the company offering the service is authorized by the National Civil Aviation Agency (ANAC), avoiding the risks of hiring a clandestine taxi-air service .   Authorized companies must use suitable aircraft to provide the service, registered as taxi-air. The airplane or helicopter must have regular documentation and up-to-date maintenance, as required by the Agency. The pilot must have a commercial pilot or li