https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/full-list-of-delta-airlines-r-customertm-contact-numbers-in-usa-the-detailed-guide-1.pdf
https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/delta-airlines-r-customertm-service-usa-contact-numbers-official-2025-guide_0.pdf
https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/connect-methods-for-delta-airlines-r-1-844-671-4437-customer-service-1-844-671-4437.pdf