https://forum.mova-tech.com/forum.php?mod=viewthread&tid=765&extra=

https://www.seniorforums.com/threads/live-agent-talk-to-someone-at-alaska-air-lines-usa-contact-numbers-the-detailed-guide.100202/

https://www.seniorforums.com/threads/full-list-of-air-canada%E2%84%A2%C2%AE%EF%B8%8F-customer-contact-numbers-in-the-u-s-a-a-detailed-guide.100131/

https://community.cybozu.dev/t/topic/10935

Full List of Delta Airline ®️ Customer Service™️Contact USA Numbers : Complete Guide

https://community.cybozu.dev/t/topic/10891

https://www.tngunowners.com/forums/topic/143101-full-list-of-expedia%C2%AE%EF%B8%8F-customer%E2%84%A2-contact-numbers-in-the-usa-the-complete-guide/

https://www.tngunowners.com/forums/topic/143225-live-talk-rep-247-full-list-of-united%C2%AE-airlines%C2%AE-customer%C2%AE-contact-numbers-in-usa-an-updated-guide/

https://community.cybozu.dev/t/topic/10898

https://forum.makeblock.com/t/20-ways-to-get-refund-from-expedia/27585