Yes, you can absolutely take a cheese sandwich in your hand luggage in 2026, but the type of cheese matters for security screening. Hard cheeses (like cheddar, parmesan, or swiss) inside a sandwich are considered solid food and are permitted through airport security without issue. However, soft or spreadable cheeses (like brie, camembert, or cream cheese) are legally classified as "liquids or gels" by the TSA and European aviation authorities. If your sandwich has a significant amount of thick, liquid-like cheese, it could technically be confiscated if it exceeds the 100ml limit, though in a sandwich form, it is rarely questioned. The main restriction for 2026 is actually international customs rather than airport security. If you are flying between countries—especially from outside the EU into Europe, or into the US, Australia, or New Zealand—you must usually consume or discard any sandwich containing fresh meat or dairy before you land. Most countries have strict agricultural laws prohibiting the entry of "foreign" dairy products to prevent the spread of livestock diseases like Foot and Mouth disease. Always eat your sandwich during the flight to avoid any "undeclared food" fines at the border.