Https://community.siemens.com/t/complete-list-of-delta-airlines-official-customer-service-u-s-based-contact-numbers-a-step-by-step-guides/3397 https://community.siemens.com/t/complete-list-of-delta-airlines-official-customer-service-u-s-based-contact-numbers-a-step-by-step-guides/3397 https://community.siemens.com/t/complete-list-of-delta-airlines-official-customer-service-u-s-based... https://community.siemens.com/t/complete-list-of-delta-airlines-official-customer-service-u-s-based-contact-numbers-a-step-by-step-guides/3397