Yes, an airline and airport security have the legal authority to open your suitcase for inspection if it is flagged during the X-ray screening process. While airlines themselves rarely open bags unless they are leaking or damaged, security agencies like the TSA in the U.S. or local airport security in Europe can and will open luggage to investigate suspicious items. This is why "TSA-approved" locks are essential; they allow security officers to use a master key to open the bag without destroying the lock. If you use a non-compliant lock and your bag is flagged, security will likely cut the lock off. In many regions, security is supposed to leave a notification slip inside the bag to inform you that it was searched, but this is not a universal requirement in every country. For 2026 travel, travelers should be aware that even "locked" bags are subject to search at any point in the transit process.