code: protected function loadCountryStateIata(PointOfRefSearchOptions $params)
      {
          if ($this->checkAnyNotEmpty($params->country, $params->state, $params->iata)) {
              $this->porFndQryParams->area = new Area(
                  $params->country,
                  $params->state,
                  $params->iata
              );
          }
      }
docs: Search by country/state/iata code?
  
  @param PointOfRefSearchOptions $params