https://wartale.com/forums/topic/183024-full-list-of-lufthansa-customer-service%C2%AE-usa-contact-numbers-us/
https://wartale.com/forums/topic/182814-full-list-of-american-airlines-official-service-number%C2%AE-usa-contact-numbers-us/
https://wartale.com/forums/topic/182577-a-quick-list-of-official-united-airlines%E2%84%A2%EF%B8%8F%C2%AE%EF%B8%8Fcustomer-usa-contact-number/
https://wartale.com/forums/topic/182758-full-list-of-united-airlines-official-service-number%C2%AE-usa-contact-numbers-us/
https://wartale.com/forums/topic/182959-fulllist-delta-airlines-%C2%AE%EF%B8%8F-official-service-number-%E2%84%A2%EF%B8%8F-usa-contact-numbers-guide-2025/
 
https://www.guilded.gg/Delta-Customer-Service/overview/news/yrx7K9ml
https://www.guilded.gg/Delta-Customer-Service/overview/news/6Qv52g3y