https://www.entmasterclass.com/forum/general-discussion/does-expedia-have-a-24-hour-cancellation-policy-how-do-i-get-a-refund-from-expedia
https://www.entmasterclass.com/forum/general-discussion/know-about-what-is-expedia-cancellation-policy-3
https://central.xero.com/s/question/0D58V00009OP2QXSA1/what-day-are-united-flights-the-cheapest-faqsusa
https://central.xero.com/s/question/0D58V00009OP2HFSA1/officialrefundhow-long-after-booking-frontier-flight-can-you-ca100refund