Okla. Stat. tit. 13, § 13-16: Acceptance of ticket, etc., as assent to contract

A passenger, consignor or consignee by accepting a ticket, bill

of lading or written contract for carriage, with a knowledge of its

terms, assents to the rate of hire, the time, place and manner of

delivery therein stated. But his assent to any other modification

of the carrier's rights or obligations contained in such instrument

can only be manifested by his signature to the same.