Yes, you can generally take manicure scissors on a plane in your carry-on luggage, provided they meet specific size requirements. According to TSA guidelines (and similar international standards like CATSA), scissors are permitted in the cabin if the blades are 4 inches (approx. 10 cm) or shorter when measured from the pivot point (the fulcrum) to the tip. Most standard manicure and cuticle scissors fall well within this limit, as they are typically only 1 to 2 inches long. However, if the blades are longer than 4 inches, they must be packed in your checked baggage. It is also worth noting that some international security checkpoints, particularly in certain European or Asian countries, may have stricter limits (sometimes as short as 6 cm). To avoid any hassle or potential confiscation, it is a good idea to pack them in a way that they are easily accessible for inspection or to use a pair with rounded safety tips. Despite being "sharp," small grooming tools are considered low-risk and are a standard exception to the "no weapons" rule in aviation security.