https://forum.sensor.community/t/complete-list-of-delta-airlines-customer-support-24-7-talk-to-person-support-numbers-an-official-guide/7116

https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12806/_sid_/contactar-con-frontier-como-puedo-comunicarme-con-frontier-en-espanol.pdf

https://forum.acuityscheduling.com/topic/378-full%E2%84%A2-list-of-travelocit%F0%9D%94%82%C2%AE-customer%C2%A9-service%E2%84%97-247-live-person-support-numbers-a-complete-guide/

https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12806/_sid_/expedia-servicio-al-cliente-telefono-como-presento-una-reclamacion-contra-expedia.pdf

https://www.goodreads.com/quotes/14431184-what-is-the-cheapest-day-to-book-a-flight-on

FDSF

https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12806/_sid_/expedia-servicio-al-cliente-telefono-como-recuperar-tu-dinero-de-expedia.pdf

https://forum.acuityscheduling.com/topic/381-full%E2%84%A2-%E2%89%8B-list-of-american-airlines%C2%AE-customer-support%E2%84%A2-numbers-247-live-person-support-247-helpline/

DF

https://artsciportal.wustl.edu/sites/artsciportal.wustl.edu/files/webform/webform_12806/_sid_/expedia-servicio-al-cliente-telefono-como-hablo-con-un-agente-de-expedia.pdf