https://www.pixiv.net/novel/show.php?id=25751439

https://forum.comicbook.com/topic/519-america%F0%9D%93%B7-customer-service%C2%AE-contact-numbers-in-usa-a-ultimate-step-by-step-guide/

https://forum.comicbook.com/topic/338-expedia%E2%84%A2%EF%B8%8F-usa%C2%AE%EF%B8%8F-customer%C2%AE%EF%B8%8F-service-numbers-live-help-anytime-the-definitive-contact%C2%AE%EF%B8%8F-list/

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https://community.keyshot.com/forum/t/full-list-of-american-airlines-customer-service-help-guide-usa-contact-number-2o25/15766

https://forum.comicbook.com/topic/451-livetalk-to-someone-at-lufthansa-%C2%AE%EF%B8%8F%C2%AE-usa-%E2%84%A2%EF%B8%8Fcontact-numbers-a-detailed-2025-guide/

https://forum.comicbook.com/topic/1085-full-list-of-delta-airlines-customer%C2%AE-support-contact-numbers-in-usa-the-ultimate-official-guide/

https://forum.comicbook.com/topic/679-allegian%F0%9D%93%BD-customer-service%C2%AE-contact-numbers-in-usa-a-ultimate-step-by-step-guide/

https://airlinesflight.zohodesk.com/portal/en/kb/articles/flight-refund-can-i-cancel-my-qatar-flight-and-get-a-refund

https://forum.comicbook.com/topic/1052-full-list-of-united-airlines-customer%C2%AE-support-contact-numbers-in-usa-the-ultimate-official-guide/