https://www.droidforums.net/threads/complete-list-of-lufthansa-airlines-r-usa-customer-servicetm-contact-numbers-full-detailed-guide.309104/

https://www.droidforums.net/threads/complete-list-of-air-canada-airlines-r-usa-customer-tm-contact-numbers-a-full-detailed-guide.309168/

https://www.droidforums.net/threads/full-list-of-expedia-r-usa-customer-tm-contact-numbers-a-complete-detailed-guide.309207/ https://www.droidforums.net/threads/full-list-of-expedia-r-usa-customer-tm-contact-numbers-a-complete-detailed-guide.309207/ https://www.droidforums.net/threads/full-list-of-expedia-r-usa-customer-tm-contact-numbers-a-complete-detailed-guide.309207/

https://tecmobowl.org/forums/topic/73883-complete-list-of-official-frontier-airlines%C2%AE-customer-service%C2%AE-contact-numbers-in-the-usa%C2%AE%C2%AE-%E2%80%93-full-detailed-guide/

https://www.oii.ox.ac.uk/wp-content/uploads/formidable/16/Contact-Methods-southwest-Airlines-Customer-Service-Number-An-All-Inclusive-Guide.pdf