https://www.devex.com/people/_-get-upport_-what-is-the-cheapest-day-to-fly-on-2451978

https://www.devex.com/people/_-get-upport_-what-is-the-cheapest-day-to-fly-on-2451978

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https://www.devex.com/people/what-is-the-24-hour-rule-for-klm-2452004