https://intercom.help/lines-c0ce497a7978/en/articles/10783018-como-hablar-con-un-representante-de-j-e-t-b-l-u-e-en-espanol

https://intercom.help/lines-c0ce497a7978/en/articles/10783138-what-day-is-the-cheapest-to-book-american-airlines

https://superuser.com/questions/1886272/flight-experts-what-day-is-cheaper-to-book-on-expedia

https://superuser.com/questions/1886272/flight-experts-what-day-is-cheaper-to-book-on-expedia

https://support.google.com/edu/classroom/thread/331212591/upgrade-policies-how-do-i-ask-a-question-at-%F0%9D%99%80%F0%9D%99%AD%F0%9D%99%A5%F0%9D%99%9A%F0%9D%99%99%F0%9D%99%9E%F0%9D%99%96

https://www.steadyhealth.com/topics/stay-connected-contact-avianca-airlines-customer-service-anytime-via-phone-email-and-chat

https://intercom.help/expedia-support/en/articles/10782660-what-is-the-cheapest-day-to-book-frontier

https://intercom.help/expedia-support/en/articles/10782471-how-do-i-escalate-a-problem-with-expedia

https://intercom.help/expedia-support/en/articles/10782471-how-do-i-escalate-a-problem-with-expedia

https://intercom.help/expedia-support/en/articles/10782471-how-do-i-escalate-a-problem-with-expedia