https://collaboratory.gse.upenn.edu/sites/default/files/webform/Contact-Methods-Lufthansa-Airlines-Customer-Service-Number-All-In-One-Guide.pdf

https://uqworld.org/t/complete-list-of-westjet-support-contact-numbers-in-the-usa-an-extended-official-guide/5292

https://uqworld.org/t/live-talk-24×7-talk-to-someone-at-westjet-airlines-usa-through-contact-numbers-the-detailed-guide/5274

http://forums.graphonomics.org/index.php?threads/full-list-of-easyjet%C2%AE-customer%E2%84%A2-service%C2%AE-usa-contact-numbers-a-step-by-step-guide.290660/

https://uqworld.org/t/jetblue-airlines-new-call-to-live-agent-usa-contact-numbers-complete-2025-u-s-a-guide/5261

https://www.companyofmen.org/topic/163417-full-list-of-united-airlines%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers/

https://www.companyofmen.org/topic/163415-full-list-of-qatar-airways%C2%A0%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers/

https://www.companyofmen.org/topic/163413-full-list-of-delta-airlines%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers/

https://www.companyofmen.org/topic/163412-full-list-of-american-airlines%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers/

https://www.companyofmen.org/topic/163411-full-list-of-lufthansa-airlines%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers/