https://www.devex.com/people/tips-tricks-what-is-the-hour-rule-for-klm-2452567

https://www.devex.com/people/tips-tricks-what-is-the-hour-rule-for-klm-2452567

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https://www.devex.com/people/tips-tricks-what-is-the-hour-rule-for-klm-2452567