NodeList airlines = doc.getElementsByTagName("airline");
            for (int i = 0; i < airlines.getLength(); i++) {
                Element airline = (Element) routes.item(i);
                iata = airline.getAttribute("iata");
                name = airline.getElementsByTagName("name").item(0).getTextContent();
                country = airline.getAttribute("country");
                Airline air = Airline(iata,name,country);
                g.addAirline(air);
            }