https://discuss.ansys.com/discussion/4087/quick-solution-what-is-the-24-hour-rule-for-lufthansa-24-7/p1?new=1

https://discuss.ansys.com/discussion/4087/quick-solution-what-is-the-24-hour-rule-for-lufthansa-24-7/p1?new=1

https://discuss.ansys.com/discussion/4087/quick-solution-what-is-the-24-hour-rule-for-lufthansa-24-7/p1?new=1