In most cases, you are not allowed to bring pepper spray on an airplane. Pepper spray is considered to be a hazardous material, and it is subject to strict regulations and restrictions when it comes to air travel. Most airlines and airports will not allow passengers to bring pepper spray on board an airplane, and any pepper spray that is discovered during security screening will be confiscated.
If you are traveling by air and you want to bring pepper spray with you, you should check with the airline and the airport to see if they have any specific rules or regulations regarding pepper spray. In most cases you will be allowed to bring your pepper spray in a checked bag. You may be able to ship your pepper spray separately, or you may be able to store it in checked baggage if it is allowed by the airline and the Transportation Security Administration (TSA).
It is important to note that even if you are able to bring pepper spray on an airplane, you may not be able to use it or possess it once you reach your destination, as the laws and regulations regarding pepper spray can vary depending on the location. It is always best to check with the authorities in the place you are traveling to, and to be prepared to leave your pepper spray behind if it is not allowed.