California Unemployment Insurance Code Section 609

(a) Employment includes service performed for an employing unit on or in connection with an American vessel operating on navigable waters within or within and without the United States or on or in connection with an American aircraft operating within or within and without the United States, if the employing unit maintains in this state an operating office from which the operations of the American vessel or American aircraft are ordinarily and regularly supervised, managed, directed, and controlled, and such services are included in employment under the Federal Unemployment Tax Act. (b) All of the provisions of this division shall be applicable to an employing unit and to service performed in employment under this section in the same manner and to the same extent as to all other employers, and the wage credits given to, and the payment of benefits to, any employee of an employing unit under this section shall be in the same amount, on the same terms, and subject to the same conditions as applied to employees of other employers under this division.