Istanbul Sabiha Gökçen International Airport Investment Development and Operation Inc. (ISG) goes on to enhance safety and quality standards and move them to international level. Turkey’s the gateway to the world, istanbul Sabiha Gökçen International Airport’s operator ISG’s Environmental Management System (ISO 14001) and Occupational Health and Safety Management System (OHSAS 18001) certificates has been approved by SGS Certification Body.