https://www.preventionweb.net/sites/default/files/webform/duplicate_academic_programs/_sid_/united-airlines-customer-service-usa-contact-numbers-guide.pdf https://www.preventionweb.net/sites/default/files/webform/duplicate_academic_programs/_sid_/United-Airlines-Customer-Service-Number-Quick-List-100-Verified-Support-USA-Helpline.pdf...