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://community.carbide3d.com/t/full-list-of-southwest-airlines-customer-service-usa-contact-numbers-a-complete-guide/94007
https://educativ.net/forums/topic/39853-ways-to-connect-with-allegiant-airlines%C2%AE%EF%B8%8F-agent-instantly/
https://educativ.net/forums/topic/39892-%E2%98%857%E2%98%85-ways-to-speak-with-allegiant-airlines%C2%AE%EF%B8%8F-live-agent-%E2%80%93-detailed-guide/
https://discuss.tindie.com/t/full-list-of-american-airlines-customer-service-usa-contact-numbers-a-step-by-step-guide/534010
https://educativ.net/forums/topic/39826-westjet-%E2%84%A2%EF%B8%8Fairlines%C2%AE%EF%B8%8F-customer-main-support%C2%AE%EF%B8%8F-usa-contact-numbers-a-complete-guide/
https://discuss.tindie.com/t/12-ways-to-contact-expedia-step-by-step-guide-to-reach-a-human-representatives/534032
https://chandoo.org/forum/threads/9-ways-to-connect-with-allegiant-airlines%C2%AE%EF%B8%8F-agent-instantly.60511/