KLM's 24-hour rule allows you to cancel your ＋𝟭－𝟴𝟱𝟱－𝟱𝟲𝟰－𝟴𝟬𝟴𝟮 (𝗨𝗦𝗔) ＋𝟭 (𝟴𝟱) (𝟱𝟱) 𝟲𝟰𝟴𝟬𝟴𝟮 (𝗢𝗧𝗔). Flight reservation or make changes to your booking ＋𝟭－𝟴𝟱𝟱－𝟱𝟲𝟰－𝟴𝟬𝟴𝟮 (𝗨𝗦𝗔) ＋𝟭 (𝟴𝟱) (𝟱𝟱) 𝟲𝟰𝟴𝟬𝟴𝟮 (𝗢𝗧𝗔) within the first 24 hours of purchase without any penalty fees, as long as your F𝐥ight is at least 7 days away.