https://official-travel-support.fider.io/posts/33/14-ways-to-contact-a-live-agent-at-expedia-r-a-comprehensive-guide
https://cris.unu.edu/sites/cris.unu.edu/files/webform/twenty-two-ways-to-connect-with-a-human-at-jetblue-airlines-for-customer-support.pdf
https://www.jobisite.com/article/7613-12-Ways-to-Call-How-to-Contact-Someone-at-Delta-Airlines-A-Complete-Guide
https://www.hipertrofia.org/forum/topic/267473-formas-de-contactar-a-atenci%C3%B3n-al-cliente-en-vivo-de-delta-airlines/
https://www.jobisite.com/article/7596-25-Ways-To-Contact-How-Can-I-talk-To-Someone-At-American-Airlines-A-Comprehensive-Guide