https://www.seniorforums.com/threads/full-list-of-allegiant-air%E2%84%A2%C2%AE%EF%B8%8F-customer-contact-numbers-in-the-u-s-a-a-comprehensive.100279/

https://community.cybozu.dev/t/topic/11474

https://www.seniorforums.com/threads/full-list-of-virgin-atlantic%E2%84%A2%C2%AE%EF%B8%8F-customer-contact-numbers-in-the-u-s-a-a-helpline.100509/

https://community.cybozu.dev/t/topic/11465

https://www.seniorforums.com/threads/full-list-of-lufthansa%E2%84%A2%C2%AE%EF%B8%8F-customer-contact-numbers-in-the-u-s-a-a-comprehensiv.100534/

https://forum.fritzing.org/t/full-list-of-qatar-airways-customer-contact-numbers-in-usa-a-ultimate-step-by-step-guide/32214

https://community.cybozu.dev/t/topic/11461

https://community.cybozu.dev/t/topic/11460

https://www.seniorforums.com/threads/live-agent-talk-to-live-agent-at-qantas-air-lines-usa-contact-numbers-detailed-guide.100490/

https://www.umass.edu/facforms/sites/default/files/webform/United-Airlines-Customer-Service-USA-Contact-Number-In-Full-Detail-Guide.pdf