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- https://www.devex.com/people/what-is-the-24-hour-rule-for-lufthansa-help-2239736
- https://www.devex.com/people/what-is-the-24-hour-rule-with-lufthansa-get-help-2239951
- https://www.devex.com/people/are-lufthansa-upgrades-refundable-quick-guide-2239402
- https://www.devex.com/people/what-is-the-24-hour-rule-for-lufthansa-know_more-2239467
