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https://www.devex.com/people/how-late-can-you-cancel-a-lufthansa-flight-new-ays-2374734

https://www.devex.com/people/can-i-change-my-lufthansa-flight-date-get-help-2375532

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https://www.devex.com/people/i-need-to-cancel-my-klm-flight-within-24-hours-of-booking-2375390

https://klse.i3investor.com/web/forum/forum-thread/909510662

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