14 CFR 253.4: Incorporation by reference in the contract of carriage.

(a) A ticket or other written instrument that embodies the contract of carriage may incorporate contract terms by reference (i.e., without stating their full text), and if it does so shall contain or be accompanied by notice to the passenger as required by this part. In addition to other remedies at law, an air carrier may not claim the benefit as against the passenger of, and the passenger shall not be bound by, any contract term incorporated by reference if notice of the term has not been provided to that passenger in accordance with this part.

(b) Each air carrier shall make the full text of each term that it incorporates by reference in a contract of carriage available for public inspection at each of its airport and city ticket offices.

(c) Each air carrier shall provide free of charge by mail or other delivery service to passengers, upon their request, a copy of the full text of its terms incorporated by reference in the contract. Each carrier shall keep available at all times, free of charge, at all locations where its tickets are sold within the United States information sufficient to enable passengers to order the full text of such terms.