https://forum.hypercore.one/t/delta-airlines-contact-support-official-usa-number-comprehensive-2025-manual/911
https://discourse.jabref.org/t/delta-airlines-contact-support-official-usa-number-comprehensive-2025-manual/5952
https://discourse.jabref.org/t/21-full-list-of-delta-airlines-customer-care-contact-numbers-in-usa/5953
https://discourse.jabref.org/t/contact-delta-airlines-in-minutes-best-toll-free-numbers-to-use/5954
https://forum.hypercore.one/t/qatar-airways-contact-support-official-usa-number-comprehensive-2025-manual/914
https://discourse.jabref.org/t/qatar-airways-contact-support-official-usa-number-comprehensive-2025-manual/5956
https://forum.hypercore.one/t/21-full-list-of-qatar-airways-customer-care-contact-numbers-in-usa/915
https://discourse.jabref.org/t/21-full-list-of-qatar-airways-customer-care-contact-numbers-in-usa/5957