KLM's 24-hour rule allows you to cancel your ＋𝟭－𝟴𝟯𝟴－𝟯𝟬𝟬－𝟯𝟴𝟯𝟬 (𝗨𝗦𝗔) ＋𝟭 (𝟴𝟯) (𝟴𝟯) 𝟬𝟬𝟯𝟴𝟯𝟬 (𝗢𝗧𝗔). Flight reservation or make changes to your booking ＋𝟭－𝟴𝟯𝟴－𝟯𝟬𝟬－𝟯𝟴𝟯𝟬 (𝗨𝗦𝗔) ＋𝟭 (𝟴𝟯) (𝟴𝟯) 𝟬𝟬𝟯𝟴𝟯𝟬 (𝗢𝗧𝗔) within the first 24 hours of purchase without any penalty fees, as long as your F𝐥ight is at least 7 days away.