https://flight-of-travel.reamaze.com/articles/easy-ways-to-call-united-airlines-customer-service-edad25a53463e635

https://expediasupporthub.deskpro.com/kb/articles/ways-to-reach-expedia-customer-service-by-phone-number-an-in-depth-guide

https://pnwmoto.com/t/klm-agente%C2%BFc%C3%B3mo-hablo-con-un-agente-de-klm.13468/

https://intercom.help/expedia-help-support-1413c7a11719/en/articles/10893037-how-to-escalate-an-issue-with-expedia

https://flight-of-travel.reamaze.com/articles/ways-to-speak-united-airlines-customer-service-by-phone-chat-sms-faq-ff363b7deebaae37

https://intercom.help/expedia-help-support-1413c7a11719/en/articles/10893034-how-to-escalate-an-issue-with-expedia

https://flight-of-travel.reamaze.com/articles/how-to-reach-united-airlines-customer-care-easily-all-contact-methods-50adcfa4c8d94ae3

https://intercom.help/expedia-help-support-1413c7a11719/en/articles/10893033-how-to-escalate-an-issue-with-expedia

https://intercom.help/expedia-help-support-1413c7a11719/en/articles/10893032-how-to-escalate-an-issue-with-expedia

https://intercom.help/expedia-help-support-1413c7a11719/en/articles/10893031-how-to-escalate-an-issue-with-expedia