https://support.google.com/edu/classroom/thread/334403545?hl=en&sjid=12092680397852412152-NC

https://papa-mishar.elevio.help/en/articles/26-expedia-support-guide-best-ways-to-reach-customer-service

https://travel.stackexchange.com/questions/194403/fa%e2%84%9asoffer-what-day-does-american-airlines-drop-prices

https://support.google.com/edu/classroom/thread/334402791?hl=en&sjid=5927242676412066671-NA

https://support.google.com/edu/classroom/threads?hl=en&thread_filter=%28category%3Aclassroom_setup%29&sjid=9480295925253397833-NA

https://papa-mishar.elevio.help/en/articles/25-how-to-contact-expedia-customer-service-a-complete-guide

https://www.quecochemecompro.com/opiniones/como-cambio-la-fecha-de-un-vuelo-en-frontier-1/

https://support.google.com/edu/classroom/thread/334400637?hl=en&sjid=7244589878502605445-NA

https://support.google.com/phoneapp/thread/334400340?hl=en&sjid=9610504312663339052-NA

https://www.quecochemecompro.com/opiniones/como-hablar-con-un-representante-de-frontier-en-espanol-24/