https://atomicacademia.com/threads/allegiant-can-i-cancel-my-allegiant-flight-without-penalty.66614/

https://forum.dimensionengineering.com/topic/30701-ways-to-make-a-call-klm-airline-customer-service-via-phone-email-and-live-chat-help-and-assistance-services-for-customers/

https://www.goodreads.com/quotes/12707266-frontier-ofrece-boletos-reembolsables

https://forum.dimensionengineering.com/topic/30673-changing-passenger-name-on-air-canada-airlines-%E2%80%93-the-smart-way/

https://www.goodreads.com/quotes/12707440-the-refundable-option-on-expedia-is-a-valuable-feature-that

https://support.google.com/admanager/thread/336789674?hl=en&sjid=12297410485133483664-NC

https://forum.dimensionengineering.com/topic/30693-ways-to-speak-american-airlines-customer-service-by-phone-chatsms-faq/

https://support.google.com/admanager/thread/336791088?hl=en&sjid=6585927535179078715-NC

https://www.goodreads.com/quotes/12707320-what-day-of-the-week-are-frontier-flights-cheapest-the

https://forum.dimensionengineering.com/topic/30549-have-questions-about-the-best-time-to-book-call-%E2%98%8E18557384265-for-expert-guidance-on-find-the-customer-service-frontier/