https://www.devex.com/people/what-is-klm-s-cancellation-policy-travel-cancellation-2301442

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https://www.devex.com/people/can-i-cancel-qatar-airways-within-24-hours-without-fees-2301492

https://www.devex.com/people/how-do-i-really-get-through-to-qatar-airways-customer-faq-2301430

https://www.devex.com/people/cancellation-and-policy-do-you-have-24-hours-to-cancel-lufthansa-flight-2302611

https://www.devex.com/people/understanding-cancellation-does-lufthansa-allow-date-change-2301526

https://www.devex.com/people/what-is-the-24-hour-rule-for-lufthansa-2301170

https://www.devex.com/people/what-is-the-24-hour-rule-for-klm-klm-faqs-modify-2301400