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https://collaboratory.gse.upenn.edu/sites/default/files/webform/full-list-of-expedia-customer-service-usa-contact-numbers-a-simple-step-guide.pdf

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https://forum.driveonwood.com/t/full-list-of-avianca-airlines-customer-service-24-7-live-person-support-numbers/11105

https://collaboratory.gse.upenn.edu/sites/default/files/webform/contact-methods-united-airlines-customer-service-number-an-all-inclusive-guide_0.pdf

https://collaboratory.gse.upenn.edu/sites/default/files/webform/expedia-customer-usa-phone-numbers-a-simple-step-guide.pdf

https://forum.ersatzteilshop.de/t/complete-list-of-official-expedia-customer-service-in-the-usa-the-step-by-step-detailed-guide/2521