California Code, Revenue and Taxation Code - RTC § 32054

No tax shall be imposed upon the sale of alcoholic beverages by a licensee in this State to a common carrier or to a person licensed to sell alcoholic beverages on boats, trains, or airplanes operated by a common carrier when the alcoholic beverages are to be used without this State; nor in such case need the common carrier procure a license for purposes of purchasing alcoholic beverages from a licensed manufacturer, wine grower, rectifier, importer, or wholesaler.