https://www.laundromatresource.com/forums/topic/23-ways-to-speak-to-american-airlines-customer-service-full-guide/

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https://www.laundromatresource.com/forums/topic/24-ways-to-talk-to-someone-at-american-airlines-a-complete-guide/

https://collaboratory.gse.upenn.edu/sites/default/files/webform/12-simple-ways-to-connect-with-expedia-customer-service-by-phone-email-or-chat.pdf

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https://www.laundromatresource.com/forums/topic/81-ways-to-call-united-airlines-usa-contact-numbers-full-detailed-guide/

https://collaboratory.gse.upenn.edu/sites/default/files/webform/12-fast-ways-to-connect-with-expedia-customer-service-by-phone-email-or-chat.pdf