https://community.cdmhub.org/t/complete-full-list-of-lufthansa-airlines-customer-support-toll-free-usa-contact-numbers-a-step-by-step-guide/2228
https://community.cdmhub.org/t/complete-list-of-delta-airlines-customer-service-usa-contact-numbers-a-step-by-step-guide/2257
https://community.cdmhub.org/t/full-list-of-american-airlines-customer-service-usa-contact-numbers-a-complete-2025-guide/2276