https://undergradresearch.gatech.edu/sites/default/files/webform/research_option_proposal_upload/_sid_/orbitz-customer-service-usa-contact-numbers-the-ultimate-full-in-depth-guide.pdf

https://forum.novaskin.me/t/official-expedi-customer-service-contact-numbers-in-the-usa-full-detailed-guides/28029

https://forum.novaskin.me/t/full-list-of-spirit-airlines-customer-contact-numbers-in-the-usa-all-official-guide/28020

https://seller-forum.com/t/full-list-of-travelocity-customer-service-contact-numbers-in-the-usa-a-step-by-step-guide/13528

https://www.pixiv.net/en/users/119262325

https://seller-forum.com/t/orbitz-usa-customer-service-full-step-by-step-guide/13540

https://forum.novaskin.me/t/condor-airline-customer-service-usa-contact-numbers-a-complete-guides/28013

https://seller-forum.com/t/talk-to-someone-at-travelocity-usa-contact-numbers-an-official-guide/13524

https://b.cari.com.my/forum.php?mod=viewthread&tid=5481576&extra=

https://seller-forum.com/t/24×7-live-agent-speak-to-live-agent-at-orbitz-usa-contact-numbers-the-detailed-guide/13536