Code of Federal Regulations Title 49. Transportation § 49.175.25 Passenger notification system

(1) A passenger is presented with information required under paragraph (a) of this section at the point of ticket purchase or, if this is not practical, in another way prior to boarding pass issuance;

(2) A passenger is presented with information required under paragraph (a) of this section at the point of boarding pass issuance (i.e. check-in), or when no boarding pass is issued, prior to boarding the aircraft;

(3) A passenger, where the ticket purchase and/or boarding pass issuance can be completed by a passenger without the involvement of another person, acknowledges that they have been presented with the information required under paragraph (a) of this section;  and

(4) A passenger is presented with information required under paragraph (a) of this section at each of the places at an airport where tickets are issued, boarding passes are issued, passenger baggage is dropped off, aircraft boarding areas are maintained, and at any other location where boarding passes are issued and/or checked baggage is accepted. This information must include visual examples of forbidden hazardous materials.