https://discourse.gaki-no-tsukai.com/t/complete-list-of-southwest-airlines-support-contact-numbers-in-the-usa-hotline-service-guide/57254
https://www.trakkulup.net/threads/full-list-of-expedia-r-customer-service-r-usa-contact-numbers-a-step-by-step.117023/
https://officialexpediasupportnumber.zohodesk.com/portal/en/kb/articles/expedia-help-is-expedia-really-fully-refundable-customer-policies-reviewed
https://discourse.gaki-no-tsukai.com/t/general-list-of-iberia-contact-numbers-in-the-usa-24-7-liveperson-the-ultimate-detailed-guide/57213