According to the Transportation Security Administration (TSA) in the United States, you are not allowed to bring knives or other sharp objects in your carry-on luggage on a plane. This includes daggers, box cutters, and other similar items. These items can be packed in checked luggage, but they should be sheathed or securely wrapped to prevent injury to baggage handlers and inspectors.

Other countries have similar rules. For example, the European Union also prohibits the carriage of knives or sharp objects in cabin luggage.

However, rules can change and may vary by country, so it is always best to check with the airline and the relevant aviation security authorities before you travel. Also, remember that local laws about the possession of knives and other weapons can vary, and just because you can pack something in your checked luggage doesn't mean it's legal to possess in your destination.