https://community.dorahacks.io/t/full-list-of-american-airlines-customer-care-service-usa-contact-numbers-a-step-by-step-guide/1601 https://community.dorahacks.io/t/full-list-of-united-airlines-customer-service-numbers-in-usa-the-updated-2025-help-guide/1922 https://community.dorahacks.io/t/complete-list-of-delta-airlines-customer-service-contact-numbers-in-usa-full-detailed-guide/1942 https://openlibrary.ecampusontario.ca/wp-content/uploads/sites/3/formidable/4/Delta-airlines%C2%AE-customer-service-contact-numbers-in-the-usa-in-Detail-guide.pdf