https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/ex-pedia-r-customer-tm-service-usa-contact-numbers-step-by-step-official-guide.pdf
https://aact.org/sites/default/files/webform/aactfest_technical_information_t/_sid_/price-line-r-customer-tm-service-usa-contact-numbers-step-by-step-official-guide.pdf
https://natforce.org/full-list-of-expedia-customer-service-numbers-in-the-usa-a-comprehensive-guide/
https://natforce.org/expedia%ef%b8%8f-customer-service%ef%b8%8f-usa-contact-numbers-an-official-guide/