You'll either have to clean ALL the gas from the tank or just start with a brand new one. ANY gas at all will not be allowed I'm sure. Even the smell of gas will probably get you dis-allowed, But I see no reason why not for the rest of it, As long as it meets the weight requirments for luggage. Have you tried just buying it a ticket? I love my bike more than my wife, (some day's anyway.) Simply explain ya just can't be without the love of your life, and ya want her in the seat next to your's on the plane.