https://www.devex.com/people/does-lufthansa-allow-free-changes-without-fees-2401467

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https://www.devex.com/people/can-i-change-my-lufthansa-flight-for-free-2402756

https://www.devex.com/people/what-is-the-24-hour-rule-for-lufthansa-c-2401389

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