code: public function setIata($code, $departureTax)
      {
          $this->iata = new Iata();
          $this->iata->setCode($code);
          $this->iata->setDepartureTax($departureTax);
  
          return $this;
      }
docs: @param string $code
  @param string $departureTax
  
  @return Transaction