https://cris.unu.edu/sites/cris.unu.edu/files/webform/33-ways-to-contact-how-can-i-speak-to-someone-at-etihad-airlines-call-now-for-rapid-support.pdf
https://cris.unu.edu/sites/cris.unu.edu/files/webform/como-con-ctese-con-un-agente-en-vivo-en-united-airlines.pdf
https://official-unitedairlines-helpcenter.fider.io/posts/2/ways-to-call-how-can-i-reach-a-live-agent-of-united-airlines-support-r-a-comprehensive-guide
https://www.wikitree.com/wiki/Space:70_Smart_Ways_to_Reach_a_Real_Person_at_Allegiant_%E2%84%A2%EF%B8%8F_Airlines_%E2%80%93_The_Complete_Contact_Guide