https://official-american-airlines-helpcenter.document360.io/docs/the-4-ways-to-communicate-with-american-airlines-customer-service-by-phone-chat-and-email-a-total-guide

https://official-delta-helpcenter.document360.io/docs/ways-to-connect-delta-customer-service-by-phone-and-email-a-detailed-guide

https://official-delta-helpcenter.document360.io/docs/ways-to-connect-delta-airlines-customer-service-by-phone-and-email-a-detailed-guide

https://official-delta-helpcenter.document360.io/docs/15-quick-ways-to-reach-delta-airlines-customer-services-via-phone-number-email-live-chat-and-other-options

https://official-delta-airlines-helpcenter.document360.io/docs/ways-to-connect-with-delta-airlines-via-phone-number-email-support-or-live-chat-a-complete-support-guide-2

https://official-delta-airlines-helpdesk2.odoo.com/knowledge/article/33

https://official-deltaairlines-helpdesk.odoo.com/knowledge/article/34

https://official-delta-airlines-helpdesk2.odoo.com/blog/our-blog-1/11-quick-ways-to-reach-delta-customer-services-via-phone-number-email-live-chat-and-other-options-2

https://official-expedia-helpcenters.odoo.com/knowledge/article/33

https://official-expedia-group-helpcenters.odoo.com/knowledge/article/34