Standard air horns that use compressed gas canisters are strictly prohibited in both carry-on and checked luggage on passenger aircraft because they are classified as hazardous pressurized containers. In 2026, TSA and international security agencies remain very strict on this; if found, the item will be confiscated and you could face a fine. However, you can travel with rechargeable electric air horns or battery-operated sonic devices, as they do not contain compressed gas. If you are a sports fan or boater needing a traditional gas air horn, your best option is to purchase one at your destination or ship it via ground freight. Always double-check the "Hazardous Materials" section of your airline's app, as some may also have restrictions on high-decibel noise-making devices in the cabin to prevent passenger disturbance.