???????????????? ???????? ???????????? 24-???????????????? ???????????????? ???????????? ????????????? A Complete Guide ????-????????????-????????????-???????????????? The 24-hour rule for KLM refers to a policy that allows passengers to cancel or change their flight within 24 hours of booking without incurring any additional fees or penalties. https://www.devex.com/people/what-is-the-24-hour-rule-for-klm-2447748