https://www.wyomilitary.wyo.gov/wp-content/uploads/formidable/14/e-x-p-e-dia-usa-customer-service-full-step-by-step-guide.pdf

https://education.aaaai.org/sites/default/files/webform/complete-list-of-official-expedia-customer-contact-numbers-in-the-usa-the-ultimate-detailed-guide.pdf

https://www.thefreshloaf.com/node/77309/16-ways-talk-live-united-airlinesr-agent-step-step-help

https://chandoo.org/forum/threads/full%E2%84%A2list-of-iberia%C2%AE-customer%E2%84%A2-service%C2%AE-usa-contact-numbers-a-step-by-step-guide.59216/

https://educativ.net/forums/topic/37386-singapore-airlines%C2%AE%EF%B8%8F-live-agent-talk-to-someone-a-step-by-step-guide/

https://educativ.net/forums/topic/37317-full-list-of-%C2%A0british-airways-%C2%AE%EF%B8%8F-customer%E2%84%A2-support%C2%AE%EF%B8%8F-usa-contact-numbers-your-expert-guide/

https://educativ.net/forums/topic/37319-full-list-of-%C2%A0iberia%C2%AE%EF%B8%8F-customer%E2%84%A2-support%C2%AE%EF%B8%8F-usa-contact-numbers-your-expert-guide/

https://educativ.net/forums/topic/37324-full-list-of-norse-atlantic-airways%C2%AE%EF%B8%8F-customer%E2%84%A2-support%C2%AE%EF%B8%8F-usa-contact-numbers-your-expert-guide/

https://educativ.net/forums/topic/37308-full-list-of-expedia-%C2%A0%C2%A0%C2%AE%EF%B8%8F-customer%C2%AE-contact-numbers-in-usa-a-ultimate-step-by-step-guide/

https://educativ.net/forums/topic/37305-full-list-of-expedi%F0%9D%93%AA%C2%AE%EF%B8%8F-customer%E2%84%A2-support%C2%AE%EF%B8%8F-usa-contact-numbers-your-expert-guide/