Https://collaboratory.gse.upenn.edu/sites/default/files/webform/contact-methods-turkish-airlines-customer-service-contact-number-an-full-inclusive-guide.pdfhttps://collaboratory.gse.upenn.edu/sites/default/files/webform/contact-methods-turkish-airlines-customer-service-contact-number-an-full-inclusive-guide.pdf https://collaboratory.gse.upenn.edu/sites/default/files/webform/contact-methods-turkish-airlines-customer-service-contact-number-an-full-inclusive-guide.pdf