PUC §24254: (a) The operation of an aircraft on the land or waters of, or in the air over, this state shall be deemed an appointment by the owner or operator of the department to be his true and lawful attorney u

(a) The operation of an aircraft on the land or waters of, or in the air over, this state shall be deemed an appointment by the owner or operator of the department to be his true and lawful attorney upon whom may be served all legal process in any action or proceeding against him, arising from the ownership, maintenance, use or operation of such aircraft and resulting in damage or loss to person or property, and said use or operation shall be signification of their agreement that any such process against him which is so served, shall be of the same legal force and validity as though served upon him personally; provided, such person is a nonresident of this state or at the time a cause of action arises is a resident of this state but subsequently becomes a nonresident of this state. (b) Service of such process shall be made by leaving a copy of the summons and complaint with the department or in its office at Sacramento, together with a fee of two dollars ($2), and by the mailing of a copy of such summons and complaint by the plaintiff or his attorney to the defendant, and to each of the defendants if more than one at his last known address, within 10 days thereafter by registered mail. In lieu of such mailing to such defendant in a foreign state, plaintiff may cause a copy of the summons and complaint to be served personally in the foreign state upon such defendant by any adult person not a party to the suit, by actually delivering the same to such defendant or by offering to make such delivery in case defendant refuses to accept delivery. (c) Proof of the service of such process upon the department, and proof of the mailing or personal delivery thereof to the defendant, shall be made by the affidavit or affidavits of the party or parties doing the acts, which shall be filed with the court from out of which such summons issued, within such time as the court may allow for the return of such summons. Process shall be deemed to be completed upon the filing of such affidavit or affidavits and of the original registry receipt issued by the post office upon the mailing of such registered letter, if service is obtained by mail.