https://regions-and-cities.europa.eu/sites/default/files/webform/multimedia_center/_sid_/aa-desde-colombia-llamar-%C2%BFcomo-hablo-con-una-persona-en-american-airlines.pdf
https://www.scienceforums.com/topic/97139-21-ways-to-call-how-to-contact-someone-at-frontier%E2%84%A2%EF%B8%8F-airlines%C2%AE%EF%B8%8F-a-step-by-step-guide/
https://www.goodreads.com/quotes/13079473-yes-aerom-xico-does-provide-refunds-1-87-78278-493-usa-but-the-conditions
https://www.scienceforums.com/topic/96376-25-ways-to-speak-to-someone-at-frontier-airlines%C2%AE%EF%B8%8F-a-complete-guide/
https://konfhub.com/twenty-ways-to-talk-to-someone-at-united-airlines-via-phone-email-or-chat-a-step-by-step-guide
