Method for encoding messages which are to be transmitted, method for decoding messages, and receiver for receiving and evaluating messages, in particular traffic messages, wherein the messages include message contents, and wherein a message contains at least one reference to an additional supplementary message which is to be transmitted separately and contains supplementary message contents. A display system is associated with an aircraft. The floor includes a longitudinally extending and integrally formed track. Accordingly, all usable and reachable code is indicated and marked. The portion of the middle conveyance path from at least the junction to the nipping portion is a conveyance path portion defined by the roller surface of the middle conveyance roller.