What are airline requirements for carrying firearms?

You can't. You can make arrangments to have them shipped in baggage. Check with the airline regulations for each airline as to the exact requirements for sending weapons and ammunition. Only active law enforcement officers may carry onto an airplane; and only then with the permission of the Captain of the plane in question. If you are a law enforcement officer, notify the clerk at your ticket counter of your credentials and ask to have the Captain advised of your request and for permission to carry. If you aren't active law enforcement then you will not be allowed to bring firearms of any kind on to the airplane. === === You also aren't allowed to bring a pocket knife or even a nail file on an airplane, nor pepper spray or even an aerosol can, such as hair spray. "If you aren't active law enforcement then you will not be allowed to bring firearms of any kind on to the airplane. " --- but you can transport unloaded firearms in your checked luggage. Check with the specific airline to be sure you comply with their rules.