https://www.historycouncilvic.org.au/allairlineshelpcenter/05_ways_to_contact_how_can_i_speak_to_someone_at_jetblue_a_comprehensive_transate_guide

service

https://www.historycouncilvic.org.au/allairlineshelphub/10_ways_to_speak_to_a_human_at_austrian_airlines_customer_service_a_step-by-step_guide

https://www.mmobugs.com/forums/index.php?threads/11-maneras-de-contactar-con-el-servicio-de-atenci%C3%B3n-al-cliente-de-american-airlines-por-tel%C3%A9fono-correo-electr%C3%B3nico-o-chat-gu%C3%ADa-completa-de-ayuda.36573/

service

https://www.mmobugs.com/forums/index.php?threads/11-maneras-de-contactar-con-el-servicio-de-atenci%C3%B3n-al-cliente-de-american-airlines-por-tel%C3%A9fono-correo-electr%C3%B3nico-o-chat-gu%C3%ADa-completa-de-ayuda.36565/

https://offcial-american-airlines-help.feedbear.com/boards/general-feedback/posts/12-ways-to-dial-how-do-i-speak-to-someone-at-american-airlines-a-complete-guide

https://www.mmobugs.com/forums/index.php?threads/11-maneras-de-contactar-con-el-servicio-de-atenci%C3%B3n-al-cliente-de-latam-airlines-por-tel%C3%A9fono-correo-electr%C3%B3nico-o-chat-gu%C3%ADa-completa-de-ayuda.36562/

https://www.perio.org/wp-content/uploads/ninja-forms/40/07-ways-to-contact-expedia-customer-service-by-phone-number-email-and-chat-options.pdf

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5320706