https://www.passionforum.ru/groups/customerhelpguide

https://events.humanitix.com/ways-to-call-united-airlines-customer-service-via-phone-email-or-chat-options-a-one-to-one-guide

https://www.dfa.ms.gov/sites/default/files/webform/gaap_debt_questionnaire/_sid_/ten-ways-to-speak-to-a-live-human-at-delta-airlines-customer-service_2.pdf

https://www.passionforum.ru/groups/vcustomerservicesguide

https://events.humanitix.com/5-easy-and-effective-methods-to-reach-united-airlines-customer-support-via-phone-number-chat-and-email-for-fast-help

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https://events.humanitix.com/seven-ways-to-call-how-do-i-talk-to-someone-at-expedia-a-complete-guide

https://events.humanitix.com/seven-ways-to-connect-how-can-i-speak-to-someone-at-expedia-a-step-by-step-guide-in-detailed