https://www.giantbomb.com/forums/general-discussion-30/cncelguide-what-is-the-24-hour-rule-for-lufthansa-1928181/

https://www.giantbomb.com/forums/general-discussion-30/cncelguide-what-is-the-24-hour-rule-for-lufthansa-1928181/

https://www.giantbomb.com/forums/general-discussion-30/cncelguide-what-is-the-24-hour-rule-for-lufthansa-1928181/