https://collaboratory.gse.upenn.edu/sites/default/files/webform/Roya-l-Customer-USA-Contact-Numbers-A-Simple-Step-Guide.pdf

https://www.dcurbanmom.com/jforum/posts/list/0/1292143.page#30778107

https://collaboratory.gse.upenn.edu/sites/default/files/webform/full-list-of-travelocity-customer-service-24-7-live-person-support-numbers-a-complete-guide.pdf

https://forums.brianenos.com/topic/317436-full-247%E2%84%A2-list-of-%E2%89%8B%EF%BD%81%EF%BD%8D%EF%BD%85%EF%BD%92%EF%BD%89%EF%BD%83%EF%BD%81%EF%BD%8E-%E2%93%9D-customer%C2%A9-care%E2%84%97-247-talk-to-person-support-numbers-an-officia/

https://community.windowcleaner.com/t/full-list-of-united-airlines-customer-service-usa-contact-numbers-your-expert-guide/59768

https://forum.driveonwood.com/t/full-list-of-icelandair-customer-service-24-7-live-person-support-numbers-a-complete-guide/10345

https://forum.driveonwood.com/t/official-complete-list-of-all-expedia-customer-contact-numbers-in-the-usa-1-a-step-by-step-guide/10347

http://linode.mono.ca.gov/does-latam-airlines-allow-refunds-after-cancellation

http://linode.mono.ca.gov/can-latam-airlines-give-me-refund-if-i-cancel-my-booking

https://forum.driveonwood.com/t/full-list-of-air-canada-customer-service-contact-numbers-in-usa-step-by-step-easy-guide/10128