https://www.devex.com/people/expedia-guide-what-is-the-refundable-option-on-expedia-2446224
https://www.devex.com/people/cheap-day-what-day-is-cheaper-to-book-on-expedia-2446232
https://www.devex.com/people/understanding-plan-what-is-the-expedia-cancellation-plan-2446263