https://sonat.com/@carrentalhelpdesk/22-ways-to-call-sixt-car-rental-support-using-their-official-phone-number-a-step-by-step-support-guide

https://www.v.org/wp-content/uploads/ninja-forms/3/55-ways-to-connect-to-live-person-at-frontier-airlines-by-phone-email-or-chat.pdf

Travel

https://helpguideperson.zohodesk.com/portal/en/kb/articles/c%C3%B3mo-hablo-con-un-agente-de-expedia-28-6-2025

https://mforum2.cari.com.my/forum.php?mod=viewthread&tid=5451722&extra=

https://sonat.com/@official-air-new-zealand-helpline/—/how-to-contact-the-air-new-zealand-baggage-helpline-usa-full-guide

https://telemartcall.zohodesk.com/portal/en/kb/articles/1-8338451858-what-is-the-24-hour-rule-for-lufthansa

https://www.v.org/wp-content/uploads/ninja-forms/3/12-Ways-to-Call-How-Do-I-Talk-to-Agent-at-American-Airlines_-A-Step-by-Step-Guide.pdf

https://v.org/wp-content/uploads/ninja-forms/3/10-ways-to-contact-a-human-at-air-france-airlines-via-phone-chat-or-email-support.pdf

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5328971