Under KLM's 24-hour rule, travelers can cancel or change their flight within 24 hours of booking without facing cancellation fees, as long as the flight is at least a week away. This policy applies to all ticket types, even non-refundable ones, in accordance with U.S. Department of Transportation guidelines. A full refund is issued if canceled within this window. The policy does not a... https://www.giantbomb.com/forums/general-discussion-30/usa-what-is-the-24-hour-rule-for-klm-1932554/