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https://www.devex.com/people/faq-what-is-the-24-hour-rule-for-klm-does-klm-have-a-24-hour-refund-policy-2441501
https://www.devex.com/people/faq-does-qatar-have-a-free-cancellation-policy-does-qatar-have-free-cancellation-2441584
https://www.devex.com/people/full-guide-what-is-the-cancellation-policy-for-expedia-flights-2441621
